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src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmi%3ET%3C%2Fmi%3E%3Cmo%3E%EF%BC%9A%3C%2Fmo%3E%3Cmi%3Et%3C%2Fmi%3E%3Cmo%3E%3D%3C%2Fmo%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmo%3E%EF%BC%9A%3C%2Fmo%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"> ，則鋼球所受重力G與泥潭對鋼球的平均阻力 <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%3EF%3C%2Fmi%3E%3Cmi%3Ef%3C%2Fmi%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"> 之比等于（　?。? </h1> <div id="dikoyc3" class="exam-s"> <span id="72t8uef" class="op-item"><span id="ouy78vm" class="op-item-nut">A . </span><span id="srjvpih" class="op-item-meat">1：1</span></span> <span id="wjmmjcl" class="op-item"><span id="z0pwqk8" class="op-item-nut">B . </span><span id="vaca85q" 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