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?（）<br>A:Differential<br>B:Trunk<br>C:Barrel<br>D:Valve-in-head

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

出自：海船船员证

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