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A flame screen ______.
A.permits the passage of vapor but not of flame
B.prevents the passage of flammable vapor
C.prevents inert gas from leaving a tank
D.permits vapors to exit but not enter a tank
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单选题A flame screen（）.A
permits the passage of vapor but not of flameB
prevents the passage of flammable vaporsC
prevents inert gas from leaving a tankD
permits vapors to exit but not enter a tank
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单选题What is the main difference between the information displayed on the dspload and the dsptrkutl screens？（）A
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The dspload screen shows the expected traffic； the dsptrkutl screen shows actual trafficeC
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单选题Which of the following statements about an LCD screen is not true?（）A
An LCD screen consumes more power than a CRT screen.B
An LCD screen display may present high-quality images but only to viewers sitting directly in fron of the screen.C
Currently, all laptops use LCD screens.D
An LCD screen is considerably more expensive than a CRT screen.
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单选题A large metallic device，mounted directly in the piping (usually located at the dock near the point where the vapor hose is attached)，designed to prevent the passage of a rapidly moving flame through the piping is called a（）.A
flame arrestorB
flame screenC
detonation arrestorD
detonation blocker
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