黑色塑料線圈,在末端有J 字形 的勾.It is black plastic coil with J - Hook on one end.衛(wèi)生間通風(fēng)統(tǒng)一由排風(fēng)扇接出,在末端安裝止回閥.Bathroom ventilation fans to unification by a row, the check valve installed in the terminal.是機(jī)械操作在末端,在緊固件表面或肩部.Facing . Facing ...