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class="ques-origin a-pointer" target="_blank"> (2022高一下·平陽期中) </a> C/2021S4彗星上一年，地上逾千年，C/2021S4是紫金山天文臺發(fā)現的售星，這顆彗星的軌道更扁一些，軌道周期更長，繞太陽旋轉一圈大約需要1000年，若地球距太陽距離為r，則該彗星繞太陽旋轉的半長軸約為（　?。? </h1> <div id="p78cbbv" class="exam-s"> <span id="nngvlh7" class="op-item"><span id="odyaiqk" class="op-item-nut">A . </span><span id="am83as8" 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%3Cmrow%3E%3Cmn%3E1000%3C%2Fmn%3E%3Cmi%3Er%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="b3pd5qk" class="op-item"><span id="ciii8le" class="op-item-nut">B . </span><span id="lbf87bv" 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%3Cmrow%3E%3Cmn%3E100%3C%2Fmn%3E%3Cmi%3Er%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="xloehza" class="op-item"><span id="ya8fm7y" class="op-item-nut">C . </span><span id="he19it7" 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%3Cmrow%3E%3Cmn%3E10%3C%2Fmn%3E%3Cmi%3Er%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="dbphww4" class="op-item"><span id="80yvnp3" class="op-item-nut">D . </span><span id="z5e1g73" class="op-item-meat">不確定</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="v9zipoy" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="d4xxprl" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=51887193" width="140px" height="140px" alt=""> <p 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