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middle;">和密度<em><span>ρ</span></em>=<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmfrac%3E%3Cmrow%3E%3Cmi%3Em%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmi%3EV%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">兩個表達式屬于比值定義式的說法正確的是（　?。? </h1> <div id="7vxz9jn" class="exam-s"> <span id="9bh7nxr" class="op-item"><span id="97nvdxx" class="op-item-nut">A . </span><span id="rp7jtzd" class="op-item-meat">只有速度<em><span>v</span></em>=<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmfrac%3E%3Cmrow%3E%3Cmi%3Es%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmi%3Et%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">屬于</span></span> <span id="lhl3nj7" class="op-item"><span id="nr7jhx9" class="op-item-nut">B . </span><span id="tlrvbhn" class="op-item-meat">只有密度<em><span>ρ</span></em>=<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmfrac%3E%3Cmrow%3E%3Cmi%3Em%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmi%3EV%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">屬于</span></span> <span id="7r57f9l" class="op-item"><span id="zrz59vf" class="op-item-nut">C . </span><span id="txnnvjz" class="op-item-meat">速度和密度兩個都屬于</span></span> <span id="rjbztjr" class="op-item"><span id="ptjjnph" class="op-item-nut">D . </span><span id="7zzb5vl" class="op-item-meat">速度和密度兩個都不屬于</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="nbjpz1z" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="txlxzv7" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img 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