题目

It is _____ good exhibition that I have seen it several times. A . so B . such C . so a D . such a 答案：D 下列洗涤方法中，利用了乳化原理的是（　　） 　 A． 用食醋除水垢 B． 用酒精清洗试管内壁上的碘 　 C． 用盐酸除铁锈 D． 用洗洁精清洗油污