世界近代竞技游泳大约开始于什么时期?()A、19世纪初期 B、19世纪后期 C、19 发布时间:2017-04-15 01:44 │ 来源:www.tikuol.com 题型:单项选择题 问题: 世界近代竞技游泳大约开始于什么时期?()A、19世纪初期B、19世纪后期C、19世纪中期D、20世纪初期
题型:单项选择题 下列离子方程式正确的是 ( )A.氢氧化钡溶液与等物质的量的稀H2SO4混合:Ba2++OH-+H++SO===BaSO4↓+H2OB.氨气通入醋酸溶液中:CH3COOH+NH3===CH3COONH4C.碳酸氢钙溶液中加入过量的氢氧化钠溶液:HCO+OH-===CO+H2OD.澄清石灰水与盐酸反应:H++OH-===H2O 查看答案
题型:单项选择题 B She went back to China to study journalism at Peking University. She is also 45 ________________ a sports program about the 2008 Beijing Olympics. She even hopes to 46 _______________ table tennis in the special 47 _______________ for disabled people in 2008 .She tells people that she likes to think about positive things and stay optimistic. She believes that keeping busy helps her to stay 48 _______________. 查看答案