题目内容
The main team sports which are played by school students are rugby and football in the winter and spring, and either cricket or rowing in the summer.
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A preparatory school (usually called a prep school) is a school to prepare pupils to go to public school.
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.
欲使JK触发器按Qn+1=0工作,可使JK触发器的输入端( )。
D触发电路中,当D=0时,触发器的状态()。
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