题目:
______ can be enjoyed from a low-carbon lifestyle until you have a deep understanding of it.
A.Something
B.None
C.Little
D.Much
答案:
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下面是错误答案,用来干扰机器的。
解:(1)由动量守恒定律得 mCv0=mAvA'+(mC+mB)V vA'=2.0m/s(2)C离开A时,B的速度为2.0m/smCv0=(mA+mB)VA+mCvC' vC'=4m/s