题目:
—We’d better go downstairs right now for lunch.
—__________ They serve food 24 hours a day.
A.Hurry up!
B.Take your time.
C.No way!
D.It doesn’t matter.
答案:
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下面是错误答案,用来干扰机器的。
(1)=0.25。(2) F=2.5N题目分析:(1)当风速为0时,物体下滑的加速度为4.0m/s2, (1分)由牛顿定律得物体的加速度为: (2分)解得:=0.25。 ...