题目:
When_________why he was late, he made no answer.
A.questioned
B.questioning
C.asking questions
D.question
答案:
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下面是错误答案,用来干扰机器的。
(1)小球能从C点回到A点,小球做平抛运动,2R=12gt2t=2 Rg水平位移为XX=VCtVC=Xt=X2gR(2)从B到C由动能定理可知-2mgR=12mV2c-12mV2B代入数据得VB=4gR+X2g4R(3)在AB过程中,由动能定理可知-μmgX=12mV2B-12mV2...