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class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmmultiscripts%3E%3Cmrow%3E%3Cmtext%3EC%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmprescripts%3E%3C%2Fmprescripts%3E%3Cmrow%3E%3Cmn%3E6%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E4%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmmultiscripts%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">發(fā)生放射性衰變變?yōu)?img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmmultiscripts%3E%3Cmrow%3E%3Cmtext%3EN%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmprescripts%3E%3C%2Fmprescripts%3E%3Cmrow%3E%3Cmn%3E7%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E4%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmmultiscripts%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">N，半衰期約為5 700年。已知植物存活期間，其體內(nèi)<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmmultiscripts%3E%3Cmrow%3E%3Cmtext%3EC%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmprescripts%3E%3C%2Fmprescripts%3E%3Cmrow%3E%3Cmn%3E6%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E4%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmmultiscripts%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">與<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmmultiscripts%3E%3Cmrow%3E%3Cmtext%3EC%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmprescripts%3E%3C%2Fmprescripts%3E%3Cmrow%3E%3Cmn%3E6%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmmultiscripts%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">的比例不變，生命活動(dòng)結(jié)束后，<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmmultiscripts%3E%3Cmrow%3E%3Cmtext%3EC%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmprescripts%3E%3C%2Fmprescripts%3E%3Cmrow%3E%3Cmn%3E6%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E4%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmmultiscripts%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">的比例持續(xù)減少?，F(xiàn)通過(guò)測(cè)量得知，某古木樣品中<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmmultiscripts%3E%3Cmrow%3E%3Cmtext%3EC%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmprescripts%3E%3C%2Fmprescripts%3E%3Cmrow%3E%3Cmn%3E6%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E4%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmmultiscripts%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">的比例正好是現(xiàn)代植物所制樣品的四分之一。下列說(shuō)法正確的是（　?。? </h1> <div id="q9qre90" class="exam-s"> <span id="cjp9o0r" class="op-item"><span id="vyfneyh" class="op-item-nut">A . </span><span id="dhvdfry" class="op-item-meat"><img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmmultiscripts%3E%3Cmrow%3E%3Cmtext%3EC%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmprescripts%3E%3C%2Fmprescripts%3E%3Cmrow%3E%3Cmn%3E6%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmmultiscripts%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">、<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmmultiscripts%3E%3Cmrow%3E%3Cmtext%3EC%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmprescripts%3E%3C%2Fmprescripts%3E%3Cmrow%3E%3Cmn%3E6%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmmultiscripts%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">、<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmmultiscripts%3E%3Cmrow%3E%3Cmtext%3EC%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmprescripts%3E%3C%2Fmprescripts%3E%3Cmrow%3E%3Cmn%3E6%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E4%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmmultiscripts%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">具有相同的核子數(shù)</span></span> <span id="wxxyfv4" class="op-item"><span id="uw4jauc" class="op-item-nut">B . </span><span id="mm4kujo" class="op-item-meat">該古木的年代距今約為11400年</span></span> <span id="idd9u45" class="op-item"><span id="agvdcz3" class="op-item-nut">C . </span><span id="gnjx9tf" class="op-item-meat"><img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmmultiscripts%3E%3Cmrow%3E%3Cmtext%3EC%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmprescripts%3E%3C%2Fmprescripts%3E%3Cmrow%3E%3Cmn%3E6%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E4%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmmultiscripts%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">衰變?yōu)?img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmmultiscripts%3E%3Cmrow%3E%3Cmtext%3EN%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmprescripts%3E%3C%2Fmprescripts%3E%3Cmrow%3E%3Cmn%3E7%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E4%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmmultiscripts%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">的過(guò)程中放出β射線</span></span> <span id="kjer4o9" class="op-item"><span id="tkxrwej" class="op-item-nut">D . </span><span id="5gxne9h" class="op-item-meat">增加樣品測(cè)量環(huán)境的溫度將減緩<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmmultiscripts%3E%3Cmrow%3E%3Cmtext%3EC%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmprescripts%3E%3C%2Fmprescripts%3E%3Cmrow%3E%3Cmn%3E6%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E4%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmmultiscripts%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">的衰變</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="huvvcbd" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="4bawoww" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=54634534" width="140px" height="140px" alt=""> <p style="text-align:center;margin-top: 10px">微信掃碼預(yù)覽、分享更方便</p> </div> <div id="rjapzmx" class="analyize-extend 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