—Where's his baseball? —I ________ know. 发布时间:2017-05-13 16:16 │ 来源:www.tikuol.com 题型:选择题 问题: —Where's his baseball? —I ________ know. [ ]A. am not B. don't C. isn't D. aren't
题型:选择题 下列离子方程式正确的是 [ ]A、H2SO4与Ba(OH)2溶液反应:Ba2++OH-+H++SO42-=BaSO4↓+H2OB、Ca(HCO3)2与过量Ca(OH)2溶液反应:Ca2++HCO3-+2OH-=CaCO3↓+CO32-+2H2O C、NaCO3溶液中通入过量CO2:CO32-+CO2+H2O=2HCO3-D、CH3COOH溶液与NaOH溶液反应:H++OH-=H2O 查看答案