看看这两个till的含义(开车前的水冲洗)? Hose connect filtered water from utility stations to V-xx. Flush D-1234 from the reflux line and drain at V-xxx till the drain water is clean. Check if the instruments can gave realistic values. Check collector and distributor in the column; make sure there is no operation and drain problem. Then close water supply, drains and all manholes till the drain water is clean. 这段话中的两处标红句 till the drain water is clean 该如何理解?(关于装置开车前的塔冲洗操作步骤)。 查看更多11个回答 . 1人已关注