单项选择题
A.大于等于DC1.5V B.大于DC1.5V C.大于等于DC1.3V D.大于DC1.3V
A.0.45～0.6MPA B.0.45～0.65MPA C.0.45～0.7MPA D.0.45～0.8MPA
A.2455N B.2445N C.2450N D.2460N
A.卸荷阀 B.排空阀 C.换向阀 D.二极管
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