The major difference between the disch

The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）

Aone valve seats upwards, while the other seats downwards
Bthe reed valves used on the discharge are made substantially thicker and heavier than the suction valves
Cthe suction valve springs exert a greater tension than the discharge valve springs
Dthe discharge valve springs exert a greater tension than the suction valve spring

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参考解析：

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