单选题Starting air valves are held firmly on their seats by（）Acam rollers on the camshaftBspring forceCair pressure on top of the valve differential pistonDair pressure on the bottom of the valve differential piston
单选题
Starting air valves are held firmly on their seats by（）
A
cam rollers on the camshaft
B
spring force
C
air pressure on top of the valve differential piston
D
air pressure on the bottom of the valve differential piston
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