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【单选题】
Which of the following is a primary characteristic of the data lock-out flip-flop?A.
Data is only clocked into the FF on the clock transition.
B.
Data can only be entered when the clock is high.
C.
Data cannot be entered into the FF unless the EN line is high.
D.
The master section is a pulse triggered type FF.
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A.
are served as
B.
serve as
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will be serve as
D.
were serve as
【单选题】The dining rooms in all big hotels ______.
A.
serve their guests free of charge
B.
also serve the people who don't live in the hotel free of charge
C.
check the guests' registration card carefully
D.
are easily cheated by people
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A.
served
B.
has served
C.
is serving
D.
would serve
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