题型:判断题 下表中物质的分类组合,完全正确的是[ ]强电解质 弱电解质非电解质A.KNO3NH3·H2O SO2 B.H2SO4CaCO3 Al C.BaSO4 HClO H2O D.HClO4 C2H5OHCH3COOH 查看答案
题型:判断题 ---Oh, Mrs. King, your dress looks nice. Is it new? ---No, I ______it since two years ago.A.hadB.boughtC.have hadD.have bought 查看答案