题目内容

Mrs. Smith plans to retire from office as soon as all her children are _________.

A. self-employed
B. self-made
C. self-supporting
D. self-respecting

查看答案

搜索结果不匹配？点我反馈

更多问题

No _________doctor would refuse to treat a sick person.

A. self-employed
B. self-made
C. self-supporting
D. self-respecting

555定时器构成的单稳态触发器的暂稳态的持续时间为

A. 1.5RC
B. RC
C. 1.8RC
D. 1.1RC

石英晶体多谐振荡器其振荡频率与电路中的（）。

A. 电阻有关系
B. 电容有关系
C. 电阻和电容无关
D. 电阻和电容有关系

单稳态触发器的暂稳态持续时间的长短取决于（）。

A. 触发脉冲的宽度
B. 电路本身的参数
C. 触发脉冲的幅度