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class="g-mn2"> <ul id="J_question_detail" > <li> <div id="c8ugeo2" class="question-block"> <div id="ewo8uay" class="q-mc"> <h1 class="q-tit"> 1. <a href="/paper/view-5465846.shtml" class="ques-origin a-pointer" target="_blank"> (2024八上·南江期中) </a> 甲、乙、丙三個人各乘一個熱氣球，甲看到樓房勻速上升，乙看到甲勻速上升，甲看到丙勻速上升，丙看到乙勻速下降，那么從地面上看，甲、乙、丙運動情況可能是（　?。? </h1> <div id="8cquo26" class="exam-s"> <span id="o2usags" class="op-item"><span id="2owyys2" class="op-item-nut">A . </span><span id="wugugym" class="op-item-meat">甲、乙一定勻速下降，且<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%3Cmsub%3E%3Cmi%3Ev%3C%2Fmi%3E%3Cmi+mathvariant%3D%22normal%22%3E%E7%94%B2%3C%2Fmi%3E%3C%2Fmsub%3E%3Cmo%3E%26gt%3B%3C%2Fmo%3E%3Cmsub%3E%3Cmi%3Ev%3C%2Fmi%3E%3Cmi+mathvariant%3D%22normal%22%3E%E4%B9%99%3C%2Fmi%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"> ，丙可能停在空中</span></span> <span id="gmkc4ge" class="op-item"><span id="yac22q4" class="op-item-nut">B . </span><span id="ageie8e" class="op-item-meat">甲、乙一定勻速下降，且<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%3Cmsub%3E%3Cmi%3Ev%3C%2Fmi%3E%3Cmi+mathvariant%3D%22normal%22%3E%E4%B9%99%3C%2Fmi%3E%3C%2Fmsub%3E%3Cmo%3E%26gt%3B%3C%2Fmo%3E%3Cmsub%3E%3Cmi%3Ev%3C%2Fmi%3E%3Cmi+mathvariant%3D%22normal%22%3E%E7%94%B2%3C%2Fmi%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"> ，丙可能勻速下降，且<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%3Cmsub%3E%3Cmi%3Ev%3C%2Fmi%3E%3Cmi+mathvariant%3D%22normal%22%3E%E4%B8%99%3C%2Fmi%3E%3C%2Fmsub%3E%3Cmo%3E%26lt%3B%3C%2Fmo%3E%3Cmsub%3E%3Cmi%3Ev%3C%2Fmi%3E%3Cmi+mathvariant%3D%22normal%22%3E%E7%94%B2%3C%2Fmi%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="qqsw2cq" class="op-item"><span id="i846eyk" class="op-item-nut">C . </span><span id="aaaeiii" class="op-item-meat">甲、乙一定勻速上升，且<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%3Cmsub%3E%3Cmi%3Ev%3C%2Fmi%3E%3Cmi+mathvariant%3D%22normal%22%3E%E4%B9%99%3C%2Fmi%3E%3C%2Fmsub%3E%3Cmo%3E%26gt%3B%3C%2Fmo%3E%3Cmsub%3E%3Cmi%3Ev%3C%2Fmi%3E%3Cmi+mathvariant%3D%22normal%22%3E%E7%94%B2%3C%2Fmi%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"> ，丙可能勻速下降，且<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%3Cmsub%3E%3Cmi%3Ev%3C%2Fmi%3E%3Cmi+mathvariant%3D%22normal%22%3E%E4%B8%99%3C%2Fmi%3E%3C%2Fmsub%3E%3Cmo%3E%26gt%3B%3C%2Fmo%3E%3Cmsub%3E%3Cmi%3Ev%3C%2Fmi%3E%3Cmi+mathvariant%3D%22normal%22%3E%E7%94%B2%3C%2Fmi%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="qku4u4m" class="op-item"><span id="amauumm" class="op-item-nut">D . </span><span id="6kkowec" class="op-item-meat">甲、乙、丙都在勻速上升，且<img class="mathml" 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