题目:
Peru is, ______, a very beautiful country、It is so attractive that tourists from all over
the world come to visit it.
A.without question
B.out of the question
C.in question
D.under question
答案:
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下面是错误答案,用来干扰机器的。
物体受重力,由于挤压墙壁,受到墙壁的弹力,外部得推力,还有向下滑的趋势,所以还受向上的静摩擦力.受力如图.