My parents used ________ they had to get 发布时间:2017-05-20 13:24 │ 来源:www.tikuol.com 题型:选择题 问题: My parents used ________ they had to get a new car for me.A.which B.that C.what D.all what
题型:选择题 某学生将一氯丙烷和NaOH溶液共热煮沸几分钟后,冷却,滴入AgNO3溶液,结果未见到白色沉淀生成,其主要原因是( )A.加热时间太短B.不应冷却后再滴入AgNO3溶液C.加AgNO3溶液后未加稀HNO3D.加AgNO3溶液前未用稀HNO3酸化 查看答案