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【单选题】
He has spent money on books.A.
plenty of
B.
a large amount of
C.
a large number of
D.
a great many 22. My dear friends, please study hard. Don’t our country and our
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【单选题】— May I park my car here? — No, you ______. No car is allowed to park here.
A.
may not
B.
needn't
C.
mustn't
D.
daren't
【单选题】Firefighters are often asked to speak to school and community groups about the importance of fire safety,particularly fire prion and detection. Because smoke detectors reduce the risk of dying in...
A.
outside fumes may trigger a false alarm.
B.
a draft may create dead-air space.
C.
a draft may pull smoke away from the detector.
D.
outside noises may muffle the sound of the detector.
【单选题】Firefighters are often asked to speak to school and community groups about the importance of fire safety,particularly fire prion and detection. Because smoke detectors reduce the risk of dying in...
A.
50% better chance of surviving a fire.
B.
50% better chance of pring a fire.
C.
75% better chance of detecting a hidden fire.
D.
100% better chance of not being injured in a fire.
【判断题】DCS是分散控制系统（Distributed Control System）的简称，国内一般习惯称为集散控制系统。它是一个由过程控制级和过程监控级组成的以通信网络为纽带的多级计算机系统。
A.
正确
B.
错误
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