题型:判断题 下列化学用语使用正确的组合是 ( ) ①Mg2+结构示意图: ②乙炔的分子结构模型示意图:③有机还原剂LiAlH4中,氢显-1价 ④质量数为40的钙原子: ⑤NH4Cl的电子式: ⑥2—甲基丁醇的结构简式:A.①②③B.②④⑤C.①③④D.①④⑥ 查看答案
题型:判断题 — When and where was the famous Chinese player bom?— He was born ______ July1981 ________ Ji'nan. [ ] A. at, in B. in, at C. in, in D. on, in 查看答案