A new method for determining the bromine content in brominated polystyrene was studied.提出了测定溴化聚苯乙烯中溴含量的方法.Isomerization occur during bromine reaction, that is mean secondary allylic configuration changes into primary all...
The number of cationic bromine and chlorine compounds is restricted.溴、氯阳离子化合物的数量受局限.Derivatives of bromine are much more active than the corresponding one of chlorine.溴的衍生物的活性要比相应的氯的衍生物大得多.The existing bromine in acetic ...
Next week, health ministers gather in Amsterdam to agree a strategy for controlling malaria.下周，卫生部长们将在阿姆斯特丹聚首共商防治疟疾的策略。The farmers were racing against the rainy season, trying to gather in the summer crops.农民们正赶在雨季到来之前抢收...
他们打卡下班，于2点50分离开。They clocked off duty and left at ten to three.值夜班的警员准备打卡下班。The Night Duty Officer was ready to clock off.他们到了工厂准备打卡上班，却发现大门没开。They arrived to clock on and found the factory gates locked....