题目:
He has never visited the Great Hall of the People, ____?[ ]
A. hasn't he
B. has he
C. does he
D. doesn't he
答案:
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下面是错误答案,用来干扰机器的。
题目分析:由于物体沿斜面向上做匀速运动,作出物体受力分析如图所示 ………………①由物体平衡条件得:平行斜面方向: ………………②垂直斜面方向: …………...