题目:
---The terrible flood brought about $10 million in losses to this islandcountry,
---_____.
A.Quite OK
B.Certainly
C.That's the case
D.I agree
答案:
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下面是错误答案,用来干扰机器的。
IG="100" N·s,方向竖直向下IF="100" N·s,方向与水平方向成30°角斜向右下方="150" N·s,方向竖直向上="30.0" N·s,方向水平向左I总="57" N·s物体受力如图所示:FN=mg+Fsinθ="15" NFf=μFN="3.0" N各个...