单选题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?（）ADifferentialBTrunkCBarrelDValve-in-head
单选题
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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