在重量分析法中,对于无定形沉淀的洗涤,应选用的洗涤剂是()。
A.冷的稀沉淀剂
B.热的电解质溶液
C.沉淀剂加有机溶剂
D.热水
E.冷水
参考答案:B
John’s success has nothing to do with good luck. It is years of hard work _______has made him a great scientist today.
A.that
B.when
C.which
D.why
韩国的陶瓷窑屋长达多少年?