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....
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...