1)automatic call device,自动关门装置2)automatic door operator,自动开门装置3)door operator,门自动启闭装置4)self-closing device,自动关闭装置5)automatic replacement device of the valve,阀门自动复位装置6)door retainer,防火门自动控制装置
用法和例句
The new-rebuilt plans for the automatic replacement device of the valve and dishing arrester are presented.