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</a> 如圖所示，a為地球赤道上的物體，b為沿地球表面附近做勻速圓周運(yùn)動的人造衛(wèi)星，c為地球同步衛(wèi)星。關(guān)于a、b、c做勻速圓周運(yùn)動的說法中正確的是（　?。?p style="text-align:justify;"><img src="http://tikupic.21cnjy.com/ct20241o/29/13/2913ffbdcd9bcf770fd79ffa2776b94a.png" width="181" height="90" style="max-width:100%;"></p> </h1> <div id="p9uip9h" class="exam-s"> <span id="pls9yvg" class="op-item"><span id="wupjav4" class="op-item-nut">A . </span><span id="4hvdrwb" class="op-item-meat">a、b、c三物體，都僅由萬有引力提供向心力</span></span> <span id="9hcgfkl" class="op-item"><span id="djromgc" class="op-item-nut">B . </span><span id="eohnz3b" class="op-item-meat">周期關(guān)系為T<sub>a</sub>>T<sub>b</sub>>T<sub>c</sub></span></span> <span id="ghax9ov" class="op-item"><span id="utzld4z" class="op-item-nut">C . </span><span id="9aaokwx" class="op-item-meat">線速度的大小關(guān)系為<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%3Ea%3C%2Fmi%3E%3C%2Fmsub%3E%3Cmo%3E%26lt%3B%3C%2Fmo%3E%3Cmsub%3E%3Cmi%3Ev%3C%2Fmi%3E%3Cmi%3Eb%3C%2Fmi%3E%3C%2Fmsub%3E%3Cmo%3E%26lt%3B%3C%2Fmo%3E%3Cmsub%3E%3Cmi%3Ev%3C%2Fmi%3E%3Cmi%3Ec%3C%2Fmi%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="dqhahqc" class="op-item"><span id="gkfcxxd" class="op-item-nut">D . </span><span id="9robxdu" class="op-item-meat">向心加速度的大小關(guān)系為<img class="mathml" 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