题目: 下列变化中,加入还原剂可以实现的是A.Ag+→AgClB.CuO→CuC.FeO→Fe2O3D.NO→NO2 答案: 答案:B加入还原剂,也就是选项中的物质被还原,其中元素的化合价将降低,其中只有B项符合题意
题型:选择题 Mrs. Green wants to buy that kind of cloth because she___________ that the cloth__________ very well.A.has been told; washesB.is told; is washedC.has been told; is washedD.is told; is washed 查看答案
题型:选择题 用计算器求86+14的按键顺序正确的是( )①输入数据86依次按键8和6;②输入数据14依次按数字键1和4;③按+键;④按ENTER.A.①②③④B.①③②④C.①④②③D.①③④② 查看答案