单项选择题
A.电空阀 B.电磁阀 C.卸荷阀 D.安全阀
A.DC20～28V B.DC20～30V C.DC20～26V D.DC18～28V
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
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