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The company should establish and maintain procedures to control all documents and date which are relevant to（）.

A.ISM
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D.SMS

單項(xiàng)選擇題

The dew point temperature is（）.

A.always higher than the air temperature
B.always lower than the air temperature
C.equal to the difference between the wet and dry bulb temperatures
D.the temperature at which the air is saturated with water vapor

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