真诚的希望各位能帮我看看这几句英文操作,我是不是误解 ...? 同意2楼,不过有一点想讨论一下,与化学无关,怎么是倒装句呢? rotary evaporation of the water-washed and dried (na2s04) extract gave 10.3 g of crude la as a brown solid which was sublimed at 80 "c (0.5 torr) to give 7.7 g (46%) of la as colorless crystals. 查看更多