题目内容

The decision whether or not we can go on a vacation to Europe __________ to money in the end; that is, how much money we can afford.

A. comes down
B. comes up
C. comes out
D. comes about

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She had __________ reasons for not supporting the proposals.

A. valuable
B. valid
C. vertical
D. virtual

The union is in __________ with management over working hours.

A. argument
B. contest
C. dispute
D. debate

下列有关施密特触发器的特点,描述正确的是( )。

A. 有两个稳态,并可自发地由一个稳态进入另一个稳态
B. 依靠输入信号的电压幅度来触发或维持电路状态
C. 两个稳态的相互转换电平不相等,即有回差
D. 广泛应用于波形变换、脉冲整形及幅度鉴别等

施密特触发器是____稳态时序电路。