The quantity of cooled air delivered by an air conditioning unit should （） the sum of the quantity of air re-circulated to the unit and the quantity mechanically exhausted.

The shutter of the evaporator was blocked with （）, it m...

单项选择题The shutter of the evaporator was blocked with （）, it means there was too much evaporation.

The inner part of the condenser should be cleaned with ...

单项选择题The inner part of the condenser should be cleaned with （）.

In the cargo winch, spur reduction gearing transfers th...

单项选择题In the cargo winch, spur reduction gearing transfers the motor drive to （）.