黑匣子的工作原理
<p><span word="A">A</span> <span word="possible">possible</span> <span word="break">break</span> <span word="in">in</span> <span word="the">the</span> <span word="mystery">mystery</span> <span word="of">of</span> <span word="the">the</span> <span word="missing">missing</span> <span word="Malaysia">Malaysia</span> <span word="Airlines">Airlines</span> <span word="Flight">Flight</span> 370 <span word="plane">plane</span> <span word="came">came</span> <span word="when">when</span> <span word="ships">ships</span> <span word="detected">detected</span> "<span word="pings">pings</span>" <span word="consistent">consistent</span> <span word="with">with</span> <span word="the">the</span> <span word="aircraft">aircraft</span>'<span word="s">s</span> <span word="black">black</span> <span word="box">box</span>. <span word="But">But</span> <span word="how">how</span> <span word="does">does</span> <span word="a">a</span> <span word="black">black</span> <span word="box">box</span> <span word="actually">actually</span> <span word="work">work</span>?</p><p><span word="Black">Black</span> <span word="boxes">boxes</span>, <span word="or">or</span> <span word="flight">flight</span> <span word="recorders">recorders</span>, <span word="are">are</span> <span word="electronic">electronic</span> <span word="devices">devices</span> <span word="that">that</span> <span word="record">record</span> <span word="information">information</span> <span word="on">on</span> <span word="an">an</span> <span word="airplane">airplane</span> <span word="to">to</span> <span word="be">be</span> <span word="used">used</span> <span word="in">in</span> <span word="the">the</span> <span word="event">event</span> <span word="of">of</span> <span word="a">a</span> <span word="severe">severe</span> <span word="incident">incident</span> <span word="such">such</span> <span word="as">as</span> <span word="a">a</span> <span word="crash">crash</span>. <span word="Usually">Usually</span>, <span word="an">an</span> <span word="aircraft">aircraft</span> <span word="carries">carries</span> <span word="two">two</span> <span word="types">types</span> <span word="of">of</span> <span word="recorders">recorders</span>.</p><p><span word="The">The</span> <span word="first">first</span>, <span word="a">a</span> <span word="flight">flight</span> <span word="data">data</span> <span word="recorder">recorder</span>, <span word="makes">makes</span> <span word="a">a</span> <span word="record">record</span> <span word="of">of</span> <span word="instructions">instructions</span> <span word="sent">sent</span> <span word="to">to</span> <span word="a">a</span> <span word="plane">plane</span>'<span word="s">s</span> <span word="electronic">electronic</span> <span word="systems">systems</span>; <span word="the">the</span> <span word="second">second</span>, <span word="a">a</span> <span word="cockpit">cockpit</span> <span word="voice">voice</span> <span word="recorder">recorder</span>, <span word="makes">makes</span> <span word="a">a</span> <span word="record">record</span> <span word="of">of</span> <span word="conversations">conversations</span>, <span word="radio">radio</span> <span word="communications">communications</span> <span word="and">and</span> <span word="other">other</span> <span word="sounds">sounds</span> <span word="in">in</span> <span word="the">the</span> <span word="cockpit">cockpit</span>. <span word="Sometimes">Sometimes</span>, <span word="the">the</span> <span word="recorders">recorders</span> <span word="are">are</span> <span word="part">part</span> <span word="of">of</span> <span word="the">the</span> <span word="same">same</span> <span word="unit">unit</span>.</p><p><span word="Black">Black</span> <span word="boxes">boxes</span>, <span word="which">which</span> <span word="are">are</span> <span word="actually">actually</span> <span word="bright">bright</span> <span word="orange">orange</span>, <span word="are">are</span> <span word="designed">designed</span> <span word="to">to</span> <span word="withstand">withstand</span> <span word="extreme">extreme</span> <span word="forces">forces</span> <span word="and">and</span> <span word="temperatures">temperatures</span>, <span word="and">and</span> <span word="are">are</span> <span word="usually">usually</span> <span word="located">located</span> <span word="in">in</span> <span word="the">the</span> <span word="tail">tail</span> <span word="of">of</span> <span word="the">the</span> <span word="aircraft">aircraft</span>, <span word="where">where</span> <span word="they">they</span> <span word="are">are</span> <span word="least">least</span> <span word="likely">likely</span> <span word="to">to</span> <span word="encounter">encounter</span> <span word="an">an</span> <span word="impact">impact</span>.</p><p><span word="Clues">Clues</span> <span word="to">to</span> <span word="missing">missing</span> <span word="flight">flight</span></p><p><span word="The">The</span> <span word="recorders">recorders</span> <span word="could">could</span> <span word="offer">offer</span> <span word="clues">clues</span> <span word="about">about</span> <span word="what">what</span> <span word="happened">happened</span> <span word="to">to</span> <span word="Malaysia">Malaysia</span> <span word="Airlines">Airlines</span> <span word="Flight">Flight</span> 370, <span word="which">which</span> <span word="disappeared">disappeared</span> <span word="enroute">enroute</span> <span word="from">from</span> <span word="Kuala">Kuala</span> <span word="Lumpur">Lumpur</span> <span word="to">to</span> <span word="Beijing">Beijing</span> <span word="on">on</span> <span word="March">March</span> 8, <span word="with">with</span> 239 <span word="people">people</span> <span word="on">on</span> <span word="board">board</span>. <span word="Investigators">Investigators</span> <span word="have">have</span> <span word="been">been</span> <span word="searching">searching</span> <span word="for">for</span> <span word="the">the</span> <span word="plane">plane</span> <span word="in">in</span> <span word="the">the</span> <span word="southern">southern</span> <span word="Indian">Indian</span> <span word="Ocean">Ocean</span> <span word="west">west</span> <span word="of">of</span> <span word="Australia">Australia</span>, <span word="where">where</span> <span word="satellite">satellite</span> <span word="data">data</span> <span word="suggests">suggests</span> <span word="the">the</span> <span word="aircraft">aircraft</span> <span word="may">may</span> <span word="have">have</span> <span word="crashed">crashed</span>.</p><p><span word="The">The</span> <span word="black">black</span> <span word="boxes">boxes</span> <span word="emit">emit</span> <span word="underwater">underwater</span> <span word="locator">locator</span> <span word="beacon">beacon</span> <span word="signals">signals</span>, <span word="or">or</span> <span word="pings">pings</span>, <span word="at">at</span> <span word="depths">depths</span> <span word="of">of</span> <span word="up">up</span> <span word="to">to</span> 20,000 <span word="feet">feet</span> (6,000 <span word="meters">meters</span>), <span word="for">for</span> <span word="up">up</span> <span word="to">to</span> 30 <span word="days">days</span> <span word="before">before</span> <span word="their">their</span> <span word="batteries">batteries</span> <span word="die">die</span>.</p>
页:
[1]