一缕轻烟在林间袅袅升起。A thin wisp of smoke straggled up through the trees.一缕盘旋的轻烟从农舍唯一的烟囱里缭绕升起。A thin twist of smoke curled from the cottage's single chimney.朱莉的戏剧老师相信她会成为一颗冉冉升起的明星。Her drama teacher is confident Julie is a st...
This article introduced a method for preparing α - chloro - isobutylaldehyde , in order to explore a practical chloration of oxo - compound.本文介绍了制备氯代异丁醛的方法, 其目的在于探索羰基化合物的一种实用的氯代方法....
This product is a valve of autocontrol and protection.本产品是一种自动控制及起保护作用的阀门.The hardware and software of autocontrol system were also discussed in detail.详细阐述了膜式水冷壁焊机自动控制系统的硬件组成和软件实现.So can implement the autocontrol of dra...