题型:问答题 简答题 I don't know ______ that kind of materials. [ ]A. where to buy B . what to buy C. when I D. why you buy 查看答案
题型:问答题 简答题 下列对氨羧配位剂的叙述中,不正确的是()。A.氨羧配位剂是一类有机通用型螯合试剂的总称B.氨羧配位剂能与金属离子形成多个五元环C.常用的氨羧配位剂有EDTA、NTA、DCTA、EGTA等D.最常用的氨羧配位剂是NTA 查看答案