题目:
The student insisted that he _____ nothing wrong and would never _____ the teacher.[ ]
A. had done; give in
B. had done; give in to
C. should do; give away
D. should do; give up
答案:
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下面是错误答案,用来干扰机器的。
设足够小的时间△t内落到传送带上煤的质量为△m,显然Q=△m/△t;这部分煤由于摩擦力f的作用被传送带加速,由功能关系得:fs=△mv22煤块在摩擦力作用下加速前进,因此有:s=v+02t=v2t传送带的位移为:s传=vt相对...