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...
Conclusion Two groups had some similar biological behaviors in cytomorphology, growth process and matrix secrete etc.结论:两组细胞保持了某些相似的生物学行为,如细胞形态 、 生长过程、基质分泌等....
It was so cold that we were able to go skating on the lake.天气极冷,我们能到湖上去滑冰了。Take your skates in case you decide to go skating.把溜冰鞋带去,说不定你们要溜冰呢.It was crazy of you to go skating on such thin ice.到这样薄的冰上溜冰,你真是疯了....