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【单选题】
欲使JK触发器按 工作,可使JK触发器的输入端____。A.
J=K=1
B.
J=K=Q
C.
J= K=0
D.
4
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【单选题】How many workers arc employed by Pou Chen Corporation（）
A.
2,200.
B.
22,000.
C.
220,000.
D.
2,200,000.
【单选题】They are ____ in work, well aware a careless mistake will cost the company millions of pounds.
A.
rather casual
B.
pretty slow
C.
meticulous
D.
really considerate
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