甘肃省兰州市永登县2020届九年级上学期期中考试化学试卷
※题型：单选题※知识点：单选题※试题难度：容易<br>下列四个短语中,其原意一定包含化学变化的是( )<br>A.花香四溢 B.海市蜃楼 C.木已成舟 D.蜡炬成灰<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/60c8f0b52ef44a0cb7ecc8ec57963d2c/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/1a01849d2058464b97ae650ee1ebbdf7/CFD24E197B77489C82CEB711782A96BC.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>下列仪器中,既能做反应器皿又能直接加热的是( )<br>A.烧杯 B.集气瓶 C.锥形瓶 D.试管<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/5a701b4aec454df2ba2eb7107da423dd/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br>略<br>※题型：单选题※知识点：单选题※试题难度：容易<br>为了全民的身体健康,我国卫生部推广使用强化加铁酱油这里的“铁”指的是( )<br>A.铁元素 B.铁原子 C.铁单质 D.铁分子<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/711e88d40057475d808364ef93fcf0b0/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/36c2bd1406834e7b893dd6d6942a1810/6780B19629767891D723CE1C62F60164.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>下列属于化学性质的是( )<br>A.挥发性 B.溶解性 C.稳定性 D.导电性<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/2504b004840f4b93bf5a9869e121b0de/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/04ce38ca2f3448d2b702b496cceeb74c/D5C6430D09DA89AC26E978594357CDD0.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>下列实验基本操作中正确的是( )<br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/7D8289E2EF00A07DDFE2E2C3434BB302.png"><br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/87B1FF3F8709C9CF43279283BC378B9C.png"><br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/63A57AC4A51B18F6FED037311189707E.png"><br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/16E0B9B83E4C1B35F9AB1F2C5E85885D.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/496957f3747148deb386f7e0c9d6bb98/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/bee7829ed0f44c9b8d36e437c4772109/D5C6430D09DA89AC26E978594357CDD0.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>下列操作或现象与分子特性对应关系不正确的是( )<br><tbody><br>选项<br>操作或现象<br>分子特性<br>A<br>气体可压缩储存于钢瓶中<br>分子间有间隙<br>B<br>物体的热胀冷缩<br>分子的大小是可以变化的<br>C<br>湿衣服晾干<br>分子是运动的<br>D<br>1滴水中大约有<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/53B17B90A8FFC1E869DA34D58CDA509E.png"><br>个水分子<br>分子很小<br></tbody><br>A.A B.B C.C D.D<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/9191e2e5bd4a4cddbcd32bb6d68baacf/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/2cfd6e31dee74847aaa7eef5624bd287/E386E9D7BEDF14AF586E66E6CC9F8A79.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>下列不利于兰州市“创建国家卫生城市”的做法是( )<br>A.道路洒水,空中喷雾<br>B.植树造林,绿化环境<br>C.焚烧垃圾,扬尘作业<br>D.加快地铁建设,减少机动车尾气排放<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/df02f89441df4ac7b08e3a3205a039e2/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/3f0d2ffbf23c454da5405921b4d1763f/C944468C3D2072816C33F81285993842.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>兰州城市形象标志(如右图)运用蓝、黄、绿三色分别代表了蓝天、黄河、绿地。黄河与兰州因缘际会,既是地理的交汇,也是文明的碰撞。下列对黄河水的认识,正确的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/C8BB837A4DE5F27235C7566860DA4FE6.png"><br>A.可以用明矾鉴定黄河水是硬水还是软水<br>B.大量使用农药、化肥,不会造成黄河水污染<br>C.黄河穿城而过,因而兰州人不需节约用水<br>D.在沉淀、过滤、蒸馏等对黄河水的净化操作中,净化程度最高的是蒸馏<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/c405abe9864c4dcbb48ca21c77bac75b/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/16465ebb5da74f2cb884a235c5d3d4fb/40E540039189DC864E16257DD5589ADC.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>某同学量取食盐水,读数时将量筒平放在实验台上,当视线仰视时读数为28mL,则量取食盐水的实际体积为( )<br>A.大于28mL B.小于28mL C.等于28mL D.无法确定<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/5d361e9f57d74e1384fdffa6df119621/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/11f1feacd6c740f0a0483bce5449668f/13185676AAE50D65BD7B8390CD59E9B1.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>制造导弹的合金材料的重要元素钕的某些信息如图所示,下列有关钕的说法错误的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2020/10/15/CC3B8F0990F6AD85F9C833C70A54CD84.png"><br>A.原子序数为60 B.属于金属元素<br>C.相对原子质量为144.2g D.核内质子数为60<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/372593bf77b740cbb2242fbeeee0c2db/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2020/3d89b3930cfe44d6bcdeaa2ab7501aff/2F70700453B718B46A7A991FE4B3263D.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列化学用语与意义对应不相符的是( )<br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/CE3FB2E68B350B28E5B76D176FE3FE33.png"><br>:一个氧分子<br>B.4Ne:4个氖原子<br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/A39832F579517F16699C19C546E9769E.png"><br>:二氧化硅<br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/D94527C8C1CDE709F740EF57CCBC5C4B.png"><br>:两个镁离子带两个单位的正电荷<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/6e26f034afa749daa80d501f49029302/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/18c44474d1204b07b970167ec4c68bb7/F37E96B9C3B5CD50C16882761F5A8E5E.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>在太空舱里,为了保持舱内的<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/3AB34B1B8224706C6E4369A324ED490A.png"><br>气体含量相对稳定,常用<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/4030F985CC9E46E401B419A1C2E1CF34.png"><br>作催化剂,将宇航员呼出的<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/3AB34B1B8224706C6E4369A324ED490A.png"><br>转化为<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/CE3FB2E68B350B28E5B76D176FE3FE33.png"><br>,<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/4030F985CC9E46E401B419A1C2E1CF34.png"><br>中铁为+3价,则Ni的化合价为( )<br>A.+5 B.+2 C.+4 D.+3<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/453236eeba854572a46820864b70f6cd/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/30b412c70158495ba079a2a9df1e27e9/2E1C063CDB9EF2C2346BF29236476D20.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>诺贝尔奖获得者屠呦呦发现的青蒿素,化学式<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/FF0002CE412F64B0264BBB3932A262BD.png"><br>,下列关于青蒿素的说法错误的是( )<br>A.青蒿素是一种氧化物<br>B.青蒿素由碳、氢、氧三种元素组成<br>C.每个青蒿素分子中含有42个原子<br>D.青蒿素中碳元素的质量分数最大<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/b37534232f1240929c66600f4005a18c/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/3e8d3acbeff5420dab9bb39fcf7b3929/A65AA92E01D79EFC6B1DBCFC9226D479.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>下列是部分元素的原子结构示意图,空格内最为恰当的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2020/9/11/9C011AEAF3490F9195D3E1FCE71BF861.png"><br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2020/9/11/EC45C6C3F7089064CF2B06C87BC66B4B.png"><br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2020/9/11/770BA3BF22E0B7F270E48CD9D6D7B19C.png"><br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2020/9/11/E6B2C95EA47D50626DBC0266EB385821.png"><br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2020/9/11/D600A9206FF63C37BFCCF5A06938EF76.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/8f66c562e4e4401e8950802fab2df92d/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2020/5a2616655e274a29b751ff064c95b8f3/EA4D2E3E18E5292277C61804BF259987.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>化学实验操作直接影响实验结果和人身安全。下列关于实验操作的说法正确的是( )<br>A.用10mL量筒量取8.55ml水<br>B.称量固体药品时,左盘放物体,右盘放砝码<br>C.试验结束后剩余的药品应放入原瓶<br>D.用排水法收集氧气时,看到水槽内管口有气泡冒出立即收集<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/2e1b2128b8754ea9b3f25de57ebb87af/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/00e12a0900ed4a02999e8dac8b367cb6/81F1ACB3330D5991F740F778E4AA74CE.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列实验现象描述正确的是( )<br>A.硫在空气中燃烧发出明亮的蓝紫色火焰<br>B.电解水的实验中负极产生的气体使带火星的木条复燃<br>C.铁丝在氧气中燃烧时,火星四射,有黑色固体生成<br>D.木炭在氧气中剧烈燃烧生成二氧化碳<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/cb93d6692dab4379ada12e0786fb6170/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/d85a572609fe4a08a0b695068a462c65/1425E5AB89E048AE340A1AAA63C465C7.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>瓦斯的主要成分是<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/CDE08DE09A11174D3A8CC4A13B43D038.png"><br>,下列四位同学对瓦斯的主要成分<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/CDE08DE09A11174D3A8CC4A13B43D038.png"><br>意义的讨论中,哪个说法是错误的( )<br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/A5A0F645D8BD80FB4ECA3E65EE3E3BC7.png"><br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/12DEF7BD1803DD4F3F0BE1E695ADA1BF.png"><br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/C695A86C486DB767375306D0DE6D2B04.png"><br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/0D1781480C149EB470AC17C0CEA5CDA8.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/1edf709113a847a9a4a9490fc18ce6d2/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/14d03cbbec854b74babb9bcbfa26780b/2DD3CC1665BFE7E007AFFAEDBC7B8EFD.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列关于四种粒子的结构示意图说法正确的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2021/2/19/8B12218E5E126F28574E020CED4EDB2B.png"><br>A.①、②的化学性质相似 B.②的粒子符号为Na<br>C.③在化学反应中易失去电子 D.④中x可能为8<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/23fc8406615049ccb59586d6e3e0c839/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br>略<br>※题型：问答题※知识点：问答题※试题难度：中等<br>用化学用语填空:<br>1.氦气______;<br>2.人们常说“高空缺氧”中的氧是______;3.2个铁离子______;4.硫的+6价氧化物______;5.地壳中含量最高的金属元素______;6.3个二氧化碳分子______。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/2318c6a1cd544b4ea290b41f568cb80a/3F6851A89CBAE72EA2EDC7505C6B0362.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/b8640c30c9794252b18c2706594f0f91/F8B85E8CFC36F2A4857AFFE3D545D40D.png"><br><br>※题型：问答题※知识点：问答题※试题难度：中等<br>如图中<br>A<br>、<br>B<br>、<br>C<br>、<br>D<br>分别是四种粒子的示意图<br>请回答:<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/28826DA784524BCCE46ECD0A806454E3.png"><br>1.以上四种粒子A和C属于______元素(填“金属”或“非金属”)<br>2.A、B、C、D四种粒子中属于同种元素的是______(填序号)。3.B在化学反应中易______电子(填“得到”或“失去”),形成______离子,符号为______。4.B和C形成的化合物是______(填化学式)。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/b0a3279608434649b63d9db2c5dae2ba/43B82F76335D6E53653F9733C1F6F109.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/348d780c27ea4f89b89d7bc4b2a9309a/2C0FB04A05E24AA1592A04D9696BDFCB.png"><br><br>※题型：问答题※知识点：问答题※试题难度：中等<br>2010<br>年<br>月<br>日是第<br>个世界环境日,世界环境日中国的主题为<br>“<br>低碳减排<br>绿色生活<br>”<br>1.由于__________(填化学式)气体的大量排放,造成全球气候变暖。<br>2.请你分别从防止大气污染和爱护水资源两个方面提出合理的具体的建议(各写一条):①防止大气污染的建议________________________________________;②爱护水资源的建议____________________________________________。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/90916001e56242bbb74b6b04e8b9d153/7D4DB94AB84F39ACA266D3728030A3CC.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/048bf1a5ac2147038ea3d5cab00196ba/DBE6691842FD1B9B3170EBB1768E05D2.png"><br><br>※题型：问答题※知识点：问答题※试题难度：较易<br>在电解水的实验中<br>与电源正极相连的玻璃管内产生的气体是<br>______<br>(填化学式)<br>当正极产生<br>4L<br>气体时<br>负极产生气体的体积为<br>______L,<br>点燃该气体时要先<br>______,<br>该反应的文字表达式为<br>______<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/4c6f0ff9a83743e787d95ace360cdf5a/D202284B7C438975B1234F85DEC64393.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/1774355885654fa4b856c0c379aeb611/075CAFDB124700381468D0E63B46415D.png"><br><br>※题型：填空题※知识点：填空题※试题难度：中等<br>现有<br>①<br>二氧化碳<br>②<br>高锰酸钾<br>③<br>铁粉<br>④<br>氧化铁<br>⑤<br>空气<br>⑥<br>湖水<br>⑦<br>水蒸气<br>⑧75%<br>的医用酒精<br>其中属于混合物的有<br>______<br>(填序号<br>下同)<br>属于单质的有<br>______,<br>属于化合物的有<br>______,<br>属于氧化物的有<br>______<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/9b55725222554704ba6718fbf3be9fc9/3AB942E9D4A9895A681D1FB294B45B94.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/c294cbf687274886a46bb3105845d53a/04B4456FEE91A67E855BD0071AADCF77.png"><br><br>※题型：问答题※知识点：问答题※试题难度：中等<br>如图是初中化学常见的仪器和实验图<br>回答下列问题:<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/4ED3EE64C64198C32B25D76F64B87B60.png"><br>1.在过滤实验中,A仪器的作用是______;<br>2.仪器C的名称是______,该仪器在实验中的用途是______;3.描述装置D进行硫在氧气中燃烧时的现象:______,并放出热量,反应的文字表达式为______,进行该实验时集气瓶底应放少量______,作用是______。4.B的名称是______,在反应中______(能或不能)直接加热。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/08ee83e5f1db40dc901cda8e4ffd4eb4/15DED95A1C794485B628D22B45796FF5.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/0ab4c8e96ee44576ae7bf77491f17ecf/FC556943631ACC27CEDAF0C6F53EE0A5.png"><br><br>※题型：问答题※知识点：问答题※试题难度：中等<br>实验室常利用以下装置完成气体制备及性质实验<br>请回答:<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/DDA512E60C9F7BAA5CB94AD0BBD07C97.png"><br>1.指出编号仪器的名称:①______,②_____。<br>2.以上______(从A-E中选择),装置有一处明显的错误,请加以改正______。利用改正后的装置继续完成后面的实验。3.欲使用高锰酸钾制取氧气,应选择的发生装置是______(填字母),反应的文字表达式为______;为防止高锰酸钾粉末进入导管,应采取的措施是______;若使用C装置收集氧气,实验结束时,应先从水槽中移出导气管,再熄灭酒精灯,原因是______。4.实验室用过氧化氢和二氧化锰制取氧气,其中二氧化锰在反应中做______,反应的文字表达式为______,应选择的气体发生装置为______,收集装置为______,选择该收集装置的理由______。若在F装置中加满水也可以用来收集氧气,则气体应从______端进入。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/08ac35d55fed4a9290cab588d50eccd1/675E9019E89AD813F401F4514A059CF5.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/d993331168f84518b5da07192d2ff106/E9C33B2BF11DA10D54A46D098DD8756E.png"><br><br>※题型：问答题※知识点：问答题※试题难度：中等<br>现代生活中<br>人们越来越注重微量元素的摄取。碘元素对人体健康有至关重要的作用。下表是某地市场销售的一种<br>“<br>加碘食盐<br>”<br>包装袋上的部分说明:<br><tbody><br>配料<br>氯化钠、碘酸钾<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/8A60F19E6DADC6B4970DD667274CF4D8.png"><br>含碘量<br>20mg-30mg/kg<br>保质期<br>个月<br>食用方法<br>勿长时间炖炒<br>贮存方法<br>避光、避热、密封、防潮<br></tbody><br>请回答下列问题:(除第(<br>)小题外<br>其它题均需写出解题过程)<br>1.由食用方法和贮存方法可推测碘酸钾的化学性质之一是______;<br>2.计算碘酸钾<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/8A60F19E6DADC6B4970DD667274CF4D8.png"><br>中,钾元素、碘元素、氧元素的质量比______;3.计算碘酸钾<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/29/8A60F19E6DADC6B4970DD667274CF4D8.png"><br>中,碘元素的质量分数______;精确到0.01%4.计算1kg这样的食盐中,应加入______g碘酸钾,用最高含碘量计算;精确到0.01%5.若含碘量按最高量计算,若要摄入0.15mg的碘元素,则应补充该加碘食盐______g。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/ffa640c15f2242f790ed2200c6541a49/B3BEEC8B3A1050D31E4EE084E208CBFC.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/35e6aa9a6da2471388bac76a3dcdcf13/68219ECFE9CD3092FA61D9F1FB6B480E.png"><br><br>
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