题目

The placethe factory is supposed to be built should bethe traffic is the lightest. A . which; where B . in which; what C . in which; where D . which; in which 答案：C10．除去下列物质中混有的少量杂质（括号内为杂质），所用方法正确的是（　　）A．FeCl2溶液（CuCl2溶液）--加过量的锌粉，过滤B．MnO2固体（KCl固体）--加足量的水溶解，过滤、洗涤、干燥C．CO气体（CO2气体）--依次通过浓硫酸和足量的氢氧化钠溶液D．KC1溶液（CaCl2）-通入过量的CO2气体，过滤