(电力)线路
参考答案:
用于电力系统两点之间输电的导线、绝缘材料和各种附件组成的设施。
补全对话,每空一词。
A:Who's your_1 friend?
B:My best friend is Xiao Li,but last week we had a big fight and now she doesn't talk to me.
A:How did it 2 ?
B:It all started when she asked me 3 she could copy my homework.
A:Why did she want to do that?
B:She said she had forgotten to do 4
A:What did you do then?
B:I told her that it was a 5 idea.
A:Did she think so?
B:No,she got really mad at me.
1.________ 2._________ 3.___________ 4._______ 5.__________
(8分)请根据下列装置,回答问题:
(1)写出标号①②的仪器名称:① ,② 。
(2)实验室制取CO2的反应方程式为 ;气体收集装置选 (填序号),检验收集的CO2气体是否已满的方法是
。F装置相对于B装置具有的优点是 。
(3)利用氯酸钾和二氧化锰的混合物制取O2后的固体残渣(假定已完全反应),通过以
下四步实验操作可回收二氧化锰。正确操作的先后顺序是 (填写选项序号)
a.烘干 b.溶解 c.过滤 d.洗涤