对于蛋白质的结晶，沉淀剂主要在溶剂上产生作用。For protein crystallization, the main impact of precipitant is on the solvent.这种蜡质属于乙醇有机溶剂的萃取物.The waxes are classed as alcohol or organic solvent extracted materials.在醇溶剂中,它不能被硼氢化物还原.It is resista...
Confine the use of insecticides to the evening and do not spray plants that are in flower.只在晚间使用杀虫剂，而且不要对正在开花的植物喷药。In remote regions, the air is pure and the crops are free of poisonous insecticides.在偏远地区，空气很纯净，庄稼也不施用有毒的...
"I'm a real intellectual-type guy, Tracy," James joked. "Oh, give me a break," Tracy moaned.“我可是个货真价实的高智商小伙儿，特雷西。”詹姆斯开玩笑地说道。“哦，别烦我了，”特雷西抱怨道。'They was his last words,'moaned Morgan,'his last words abov...