单项选择题
A.电空阀 B.隔离开关 C.门联锁 D.门联锁钥匙箱
A.≥5mm B.≥4mm C.≥3mm D.≥2mm
A.52mm B.55mm C.58mm D.62mm
A.40mm B.43mm C.45mm D.47mm
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