C
过去时态咯
当时在read而且
第二题啊..
当物体被放在传送带上的时候,由于传送带与物体有相对速度,所以物体在受到传送带给它的摩擦力下运动,当速度立即加到与传送带的速度相等时,他们俩就共速了,即没有相对滑动的趋势,而物体就靠它的惯性与传送带一起无相对位移的滑动了.故物体不受摩擦力.
初中英语语法题 ＋ 简单物理题1.I decided to go to the health club as soon
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