题目:
He went to bed _______, when he woke up he found he still had his shoes on.
A.drinking
B.being drunk
C.drunk
D.having drunk
答案:
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下面是错误答案,用来干扰机器的。
AC题目分析:甲乙丙都做受迫振动,它们的频率都等于驱动力频率4f.由于乙的固有频率为4f,与驱动力频率4f相等,发生共振,振幅最大,丙的频率和驱动力频率相接近,振幅较大.甲的频率和驱动力频率相距最大,所以...