400-600-1123
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答案：
D
已知 移�
（1）没有移走前，oil的体积是全部体积的1/2 所以200=（1/2-3/7）V V=2800加仑 充分
（2）移走后，剩下的体积比总体积少1600加仑，所以（V-1600）/V=3/7 V=2800加仑 充分 所以选D
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