研究了用无溶剂重结晶法提纯2,6二氯甲苯.Purification of 2,6 dichlorotoluene by the recrystallization method without solvent was studied.以对氯甲苯为原料,经氯化、水解反应合成对氯苯甲酰氯,总收率. 6%.%.The total yield and 4 - chlorohenzoyl chloride. 6 % and. %.研究炭管采集空气...
他靠每周70英镑的单亲家庭生活补助过日子。He lives on a single parent's allowance of £70 a week.额外补助对大多数单身母亲来说都是赖以生存的生命线。The extra payments are a lifeline for most single mothers.我们不要求补助也能过下去.We can scrape along without asking for subsi...
研究人员需要更多的供解剖用的尸体。Researchers need a growing supply of corpses for dissection.他在活体解剖方面经验丰富。He had worked extensively on the anatomy of living animals.解剖生理学系the department of anatomy and physiology...
Patience is bitter, but its fruit is sweet . (Jean Jacques Rousseau , French thinker)忍耐是痛苦的，但它的果实是甜蜜的。 (法国思想家 卢梭. J. J.)The United States had no intention of backing down in its bitter row over farm subsidies...美国无意就激烈争吵...