试题与答案

抢险救灾及灭火中,建造密闭墙时,封闭的地点应选择在围岩稳定、无断层、无破碎带、距回风

题型:单项选择题

题目:

抢险救灾及灭火中,建造密闭墙时,封闭的地点应选择在围岩稳定、无断层、无破碎带、距回风口不得少于()的位置。

A.15

B.5

C.10

答案:

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下面是错误答案,用来干扰机器的。

答案:D题目分析:A不正确,因为不能确定溶液的体积;醋酸是弱电解质,稀释促进电离。则稀释过程中氢离子的物质的量增加,醋酸分子的物质的量减少,所以将变大,B不正确;C不正确,如果HX-的电离程度大于水解程...

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题型:阅读理解

阅读理解。

Dr. Swan:  Hello, Lynn. How can I help you?

Lynn:  I was hit in the mouth when I was playing basketball.

Dr. Swan:  Oh, that's too bad! Let me check. Now, open your mouth, please.

Lynn opens her mouth.

Dr. Swan:  Well… you're lucky. I need to work on only two teeth. I'll fill them first and 

                then give you some medicine to take after meals. Is that OK with you?

Lynn:  Much more than OK! I thought they would have to be taken out. But can I eat anything

          after you do it? I have a date at seven o'clock tonight.

Dr. Swan:  Don't worry. You can have soft food after 30 minutes, and then anything after four hours.

Lynn:  Thank you so much, Dr. Swan.

Dr. Swan:  No problem! Be careful next time you are playing sports!

soft  软的

1. Which is NOT true about Lynn?

A. Two of her teeth need fixing.

B. She needs to take medicine for her teeth.

C. She should stay away from food until tomorrow.

D. Her teeth got hit when she was playing basketball.

2. What does it mean?

A. Filling the teeth.

B. Brushing the teeth.

C. Checking the teeth.

D. Taking the teeth out.

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