單項選擇題Air conditioning is the process of treating air to control （） its temperature, humidity, cleanliness and distribution to meet the comfort requirements of the occupants of the conditioned space.
A.instantaneous
B.instantaneously
C.simultaneous
D.simultaneously
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1.單項選擇題（）, iea steam cooler, may be filled in the boiler system to control the superheated steam temperature.
A.An economizer
B.An attemperator
C.A water dram
D.A down-comer tube
2.單項選擇題Upon the completion of required tests, a （） should be placed on each extinguisher, showing the date and the person who completed the tests.
A.cap
B.disc
C.tag
D.cover
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