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单选题
The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）
A
one valve seats upwards, while the other seats downwards
B
the reed valves used on the discharge are made substantially thicker and heavier than the suction valves
C
the suction valve springs exert a greater tension than the discharge valve springs
D
the discharge valve springs exert a greater tension than the suction valve springs
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更多 “单选题The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）A one valve seats upwards, while the other seats downwardsB the reed valves used on the discharge are made substantially thicker and heavier than the suction valvesC the suction valve springs exert a greater tension than the discharge valve springsD the discharge valve springs exert a greater tension than the suction valve springs” 相关考题
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