题目内容
The device, which is installed in the compressor suction line to prevent liquid from entering the compressor when hot gas defrosting, is called a( )
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( )for cargo spaces and living spaces are normally based on a given number of air changesper hour.
An exhaust fan is commonly installed to avoid excessive( )air pressure in the space.
( )may be defined as the process of adding heat to an enclosed space to maintain itstemperature above ambient.
On board ships, temperature maintenance can be made easier by increasing the ratio ofrecirculated to fresh air. Most air conditioning units have( )for adjusting this ratio.
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