单选题Restrictions occurring in the small orifices of pneumatic control system components can be used by （）Amoisture in the compressed air supplyBexcessive dryness in the compressed air supplyCpressure surging in the compressed air receiverDinsufficient lubrication of the system components
单选题
Restrictions occurring in the small orifices of pneumatic control system components can be used by （）
A
moisture in the compressed air supply
B
excessive dryness in the compressed air supply
C
pressure surging in the compressed air receiver
D
insufficient lubrication of the system components
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