欲用 EDTA 溶液滴定金属离子 M 和 N 混合溶液中的 M, 已知 N 对 M 的滴定产生干扰 , 今在某一 pH 下 , 加入掩蔽剂 A, 当 a N(A)>>K(NY) 时 , 说明 A 的掩蔽效果 __________, 此时络合剂的副反应系数 a Y 决定于 ________________
【简答题】阅读短文,判断下列句子是否与短文的内容相符,相符的打“√”,不符的打“×”。 Monday through Friday the Chen family is very busy. Mr Chen is an engineer in a company (公司). He works from 8: 00 a. m to 5: 00 p. m. He goes to work in a compan...
【简答题】阅读短文,判断下列句子是否与短文的内容相符,如相符,请在括号内写“T”,否则写“F”。 Betty and Kate are sisters. They're from the USA. They're in Beijing. Now they're looking at a map of Beijing. They're going to visit the Great Wall first. ...