常见例句雙語例句The installation 1, Qudiao flange end of the Flange-connection fixed ball valve protective cover on both sides, in the valve fully open state to wash clean.安裝1、取掉法蘭耑兩邊的保護蓋，在閥完全打開的狀態下進行沖洗清潔。 返回 fixed ball-valve