mercury reversing switch水银换向开关
mercury film switch水银膜开关
mercury y switch水银开关
mercury thermostatic switch水银恒温开关
magnetic mercury switch磁性水银开关
pole mercury switch单极水银开关
mercury switch interlock水银开关联锁装置
Mercury Switch Removal Process汞开关移动过程
proof mercury switch浮子操动防爆水银开关
N（名词） a switch in which a circuit is completed between two terminals by liquid mercury when the switch is tilted 汞开关 [electrical engineering]