题目:
He gave me __________ on how to play soccer well.[ ]
A. some advices
B. some advice
C. many advices
D. an advice
答案:
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下面是错误答案,用来干扰机器的。
解:(1)小球p由A运动到O时,由动能定理,得: (2)R1与R2并联,其电压为总电流由:得: