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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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Restrictions occurring in the small orifices(孔) of pneumatic control system components can be caused by ______.A.moisture in the compressed air supplyB.excessive dryness in the compressed air supplyC.pressure surging in the compressed air receiverD.insufficient lubrication of the system components
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考题
单选题During repair,lubrication lines and orifices must be （）.A
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考题
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考题
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考题
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考题
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考题
单选题A CO2 portable extinguisher is annually checked by（）.A
reading the gage pressureB
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考题
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seeing if the seal has been broken
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