这部手稿只是他们的珍藏之一。The manuscript is just one of the treasures in their possession .敌军士兵劫掠走了艺术博物馆的珍藏.The enemy soldiers have looted the treasures of the art museums.敌军士兵抢走了艺术博物馆的珍藏.The enemy soldiers looted the treasures of t...
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...