了解三氯 乙醛 的毒性和致突变作用.Acute toxicity test , mutation test and single - cell gel electrophoresis ( SCGE ) were used.三氯乙醛是无色挥发性的液体,带有刺激性很强的气味,在97.7℃沸腾.Chloral is a colorless, volatile liquid with a very penetrating odor and bo...
图 4-9 中使用的机械式继电器, 可以用电子开关来代替.The mechanical relays , which have been assumed in Fig . 4 - 9 , can be replaced by electronic switches.用继电器操作的一种可视信号或音响信号装置, 用以指示有关电路的情况.A visual or audible signaling device , operated by re...
The engineer was an eager participant in technical co-operation.那位工程师热心参与技术合作。One who a mask, especially a participant a masquerade or masque.戴面具的人戴面具的人, 尤指假面舞会参加者.There is no comparison between the knowledge and skill o...
When sorrows come, they come not singly but in battalions.当悲痛的事降临时,总不会单行, 它们是接踵而来.The government began to recruit new battalions.政府开始征集新的部队。God is always on the side of the strongest battalions.上帝总是帮助强者.There were battal...