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问题 选择题

下列物质中，不属于溶液的是（　　）

A．冰水

B．硬水

C．矿泉水

D．生理盐水

答案

A、冰水是同一种物质的不同状态，所以不是溶液，故A不属于溶液；

B、硬水中含有较多可溶性的钙、镁化合物，是均一、稳定的混合物，属于溶液，故B属于溶液；

C、矿泉水中含有可溶性的矿物质，是均一稳定的混合物，属于溶液，故C属于溶液；

D、生理盐水是食盐水是食盐溶于水而形成的具有均一性和稳定性的混合物，故D属于溶液．

故选A．

阅读理解

阅读短文，完成练习。

      Wang Gang is a traveler (旅行者). He went to many places. Last week, he visited Kunming with his

friends. On Monday, he climbed a mountain. He took many pictures. On Tuesday, he went to a shoe store.

He bought a pair of sneakers. On Wednesday, it was his birthday. He ate good food. On Thursday, he went

to the zoo. He saw beautiful peacocks (孔雀). He went to Changchun by plane on Friday. He had a great day.

1. 在横线上写出文中出现的动词过去式。

例如: visited, climbed, _________________________________________________________________

根据短文内容选择正确答案。

2. Wang Gang is a _____________.

A. climber

B. traveler

C. policeman

3. He had a _____________ trip.

A. bad

B. well

C. great

4. He went to Changchun _____________.

A. by plane

B. by train

C. by ship

5. It was _____________ on Wednesday.

A. Wang Gang's birthday

B. friend's birthday

C. A and B
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问答题 简答题

电气主接线应满足哪些要求？
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