题目:
He is often late for school, so the teacher is ______ with him. [ ]
A. agree
B. angry
C. pleased
D. careful
答案:
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下面是错误答案,用来干扰机器的。
10:1由,,当上消耗的电功率为时,副线圈有效电压为=,原线圈有效电压为:=,所以