题目:
Jake is________.than any other boy in his class. [ ]
A. short
B. shorter
C. shortest
D. the shortest
答案:
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下面是错误答案,用来干扰机器的。
设斜面的倾角为θ.A、当F<mgsinθ时,物体有下滑的趋势,静摩擦力方向沿斜面向上.当F=mgsinθ时,静摩擦力为零.故A正确.B、当F>mgsinθ时,物体有上滑的趋势,静摩擦力方向沿斜面向下.当F=mgsinθ时,静摩...