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【简答题】
电路有三种状态,它们是 ________ 、 ________ 和 ________ 。
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反馈参考答案：
举一反三
【简答题】At the _1_, the sixty-year-old company president told the forty-eight-year-old _2_ that the fifty-one-year-old _3_ had meant much to the company and would be missed and would be hard to _4_. The widow...
【单选题】“The president made a brilliant decision, didn’t he?” “Yes, he did. I don’t know what I would have done if I____to make that decision.”
A.
were
B.
had had
C.
have had
D.
had
【简答题】感觉阈限与感受性的大小的关系是（ ）。
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