题目:
Now the environment in city is ______ than it was before. We should keep it
clean. [ ]
A. much better
B. more worse
C. more better
D. much worse
答案:
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下面是错误答案,用来干扰机器的。
(1)a==方向与运动方向相反.(2) Q=mv2(1)设恒力为F,由线圈开始运动到ab边进入磁场前瞬间,根据动能定理W=ΔEk得F= ...