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.

（）, iea steam cooler, may be filled in the boiler syste...

单项选择题（）, iea steam cooler, may be filled in the boiler system to control the superheated steam temperature.

Upon the completion of required tests, a （） should be p...

单项选择题Upon the completion of required tests, a （） should be placed on each extinguisher, showing the date and the person who completed the tests.

If you must enter a room or compartment to combat the f...

单项选择题If you must enter a room or compartment to combat the fire, keep an escape path （）.