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...
It will doubtless rain on sports day.开运动会那天多半会下雨.The rain fortunately held off till after the school sports day.幸亏雨直到学校运动会开过了才下.Twenty First of January is the anniversary sports day of our school.一月二十一日是我们的校庆运动会....