复合模打料装置要力求(),安装、维修方便。A、结构多变 B、结构简单 C、零件简单 D、打 发布时间:2021-02-13 08:29 │ 来源:www.tikuol.com 题型:单项选择题 问题: 复合模打料装置要力求(),安装、维修方便。A、结构多变B、结构简单C、零件简单D、打料快捷
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题型:单项选择题 现有某金属的硝酸盐2.160g,充分加热分解生成金属氧化物0.960g和NO2、O2的混合气体0.0270mol(不考虑N2O4).请填空: (1)混合气体中NO2的物质的量为________mol.(2)将此组成的混合气体通入足量水中,剩余气体在标准状况下体积为________mL. (3)该反应中金属元素的化合价________(填升高、降低、不变). (4)写出该硝酸盐分解的化学方程式,标明电子转移的方向和数目. 查看答案
题型:单项选择题 A: How many oranges do we need? B: Let me _______. Three. [ ]A. think B. think of C. think over D. think out 查看答案
题型:单项选择题 —Where is Jack? —He_____ to London. [ ]A. has gone B. has been C. have gone D. have been 查看答案