闪光报警器的输入是（）信号，每个闪光报警回路可以输入一个（）信号。
参考答案：电接点；常开或者常闭电接点
—We’ve missed the last bus! Now We’ll have to walk home．
Yes, we the library five minutes earlier．
A．would have left
B．must have left
C．might have left
D．should have left
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