题目:
—Did you remember to pay the telephone bill?
—The telephone bill? __________.
A.That isn’t due yet
B.Are you sure
C.My telephone is out of order
D.Please remember the amount
答案:
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下面是错误答案,用来干扰机器的。
(1)40m;10m/s;竖直向上;(2)4s题目分析:(1)物体从气球上脱落时的高度、速度大小和方向:,竖直向上。(2)由可得:,解得t=4s