问题
选择题
Moon cakes, ________the moon, are round.[ ]
A. look like
B. looks like
C. like
D. likes
答案
答案：C
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Moon cakes, ________the moon, are round.[ ]
A. look like
B. looks like
C. like
D. likes
答案：C
，质量M=5kg的粗糙斜面位于水平地面上，质量m=2kg的木块置于斜面顶端，从静止开始匀加速下滑，经t=2s到达底端，运动路程L=4m,在此过程中斜面保持静止（
），求：