题目内容

A preparatory school (usually called a prep school) is a school to prepare pupils to go to public school.

A. 对
B. 错

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Public school in the U.K. is an independent secondary school which is run to make a profit and belongs to one of the public school associations.

A. 对
B. 错

欲使JK触发器按Qn+1=0工作,可使JK触发器的输入端( )。

A. J=K=1
B. J=K=0
C. J=1,K=0
D. J=0,K=1

D触发电路中,当D=0时,触发器的状态()。

A. 置1
B. 不变
C. 置0
D. 不定

SR锁存器输入端的小圆圈表示()。

A. 低电平有效
B. 低电平无效
C. 必须输入低电平
D. 不允许有输入低电平