李明和小兵对下列说法把握不定,争议不休,你认为正确的是(   

李明和小兵对下列说法把握不定,争议不休,你认为正确的是(      

   A.对同一物体来说,速度较快时总要比速度较慢时的惯性大

   B.电流的磁效应是丹麦物理学家奥斯特在1820年发明的

   C.声音和电磁波都不能在真空中传播

   D.因为水的比热容较大,所以汽车发动机冷却系统用水作为工作物质

答案

D

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