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【单选题】
在下列门电路中,输出端不可以并联使用的是 。A.
三态门
B.
具有推挽输出结构的 TTL 门电路
C.
CMOS 传输门
D.
集电极开路门（ OC 门）
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反馈参考答案：
举一反三
【单选题】. I just managed to _____ a quick breath before I was sucked under the water by the passing boat.
A.
snatch
B.
scratch
C.
scrape
D.
scan
【单选题】He ____ the medicine quickly then drank some orange juice. A) sucked B) swallowed C) licked D) digested
A.
sucked
B.
swallowed
C.
licked
D.
digested
【单选题】From the last paragraph we may infer that______.
A.
there is a fear of being sucked in and dragged down by our consumer culture
B.
pleasure-seeking and blind acquisition is popular in our society
C.
one should not default on one's bills
D.
American society is not as secure as people assume
【单选题】Bacteria came into a ventilation system when______.
A.
cool air was sucked into it
B.
warm air was sucked back
C.
cool air was sucked back
D.
warm air was sucked into it
【简答题】Time is like water ed in the sponge.
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