It shall have SF6 gas density relay and emergency alarm as well as blocking operating mechanism.

有SF 6气体密度继电器，并能事故报警，及闭锁操作机构。

youdao

It shall have SF6 gas density relay and emergency alarm as well as blocking operating mechanism.

有SF 6气体密度继电器，并能事故报警，及闭锁操作机构。

youdao