除去下列物质中少量杂质的方法正确的是 (　　)_刷题宝

题干

除去下列物质中少量杂质的方法正确的是 (　　)

A：除去CO₂中混有的HCl：用饱和碳酸钠溶液洗气

B：除去NO₂中混有的NO：用水洗气

C：除去FeCl₂溶液中混有的FeCl₃：加入过量铁粉，过滤

D：除去Cu粉中混有的CuO：加适量稀硝酸后，过滤、洗涤

上一题下一题 0.0难度选择题更新时间:2019-11-20 09:52:51

答案(点此获取答案解析）

C

同类题1

展开式中的常数项为

同类题2

阅读理解。

Hi, everyone! My name is Wang Kai. I'm twelve. I'm in Class 5 Grade 7. Teachers' Day is coming. I want to give some presents to my teachers.

Miss Zhang is my English teacher. She is twenty-four years old. She likes flowers very much. I want to give her some flowers from my garden. My Chinese teacher has a four-year-old son, Li Xin. He likes playing football a lot. I want to give my Chinese teacher a “special” present: playing football with Li Xin for a day! What about my maths teacher Mr. Zheng? He likes drawing pictures. I would like to draw a picture of him and give it to him.

My friends, what presents do you usually give to your teachers? Please tell me!

同类题3

欧姆表是由表头、干电池和调零电阻等串联而成的，有关欧姆表的使用和连接，下列叙述正确的是(　　)

同类题4

有质量为24kg、体积为6×10^﹣³m³的物体不慎掉入湖里，一名潜水员下水打捞它．（取g=10N/kg）求：

同类题5

下列句子中破折号的作用不同于其他的一项是（）

小学学科试题库

初中学科试题库

高中学科试题库