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單項選擇題

In order to distribute the side pressures over a wide area of the cylinder walls and liners, which of the listed types of pistons are used in modem low pressure air compressors?（）

A.Differential
B.Trunk
C.Barrel
D.Valve-in-head

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單項選擇題

A cracked diaphragm in a thermostatic expansion valve will cause the valve to （）.

A.return to a neutral position
B.flood the evaporator
C.open
D.close

單項選擇題

If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the （）.

A.control air system
B.forced draft air system
C.supply air system
D.ships service air system

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