防护效果最好的呼吸器是()。A.滤筒式呼吸器 B.供气式呼吸器 C.防尘式呼吸器

题型:单项选择题

问题:

防护效果最好的呼吸器是()。

A.滤筒式呼吸器

B.供气式呼吸器

C.防尘式呼吸器

考点:机动车维修技术车身修理安全知识车身修理安全知识题库
题型:单项选择题

阅读理解。

     Mrs. Smith often felt lonely when her husband went to work. The room was small and it took her only

 half an hour to tidy it. She couldn't get up early in the morning, so Mr. Smith had to cook breakfast

 himself. She usually had some bread and milk for lunch and only cooked spper for herself and her husband. They had no television. Mr. Smith always went to bed at nine.

     It was a winter morning. The sun was shining and it was warmer outside than it in the room. The woman

  sat on the step of a shop, 100-king at the busy traffic.  At that moment a man with a map in his hand was

  coming towards her.

     "Excuse me, madam," said the man. "Could you tell me how to get to the nearest hospital, please?"

     Mrs. Smith looked at him up and down. "He seems to be a farmer," the woman said to herself.  "Let

 me play a joke on him. " Then she turned to him and said, "Lie down in the middle of the street and you'll

 soon be sent to a hospital. "

     "Please set an example to me, then," said the man.

     She had to tell the way to him and then she said, "I think you have been in a city for the first time.  It's

 much more beautiful than the field. Is that right?"

     "Yes, madam," said the farmer with a smile  "But I think it was built on the field! "

1. Mr. Smith always went to bed at nine because _____..

    A. he was in poor health    

    B. he had nothing to do in the evening

    C. there was no lamp in the room

    D. he was very tired in the daytime

2. Mrs. Smith sat on the step to _____..

    A. look at the traffic

    B. buy some cheap things in the shop

    C. wait for her husband

    D. bathe (沐浴) in the sunlight

3. The woman thought _____, so she was going to laugh at him.

    A. the man was poor

    B. the man would ask her the way     .

    C. the man was a traveler

    D. the man came from a village

4. Which of the following is TRUE?

    A. Mrs. Smith smiled at the farmer.

    B. Mrs.  Smith got the farmer into trouble.

    C. rhe farmer cleverly answered the woman.

    D. The farmer didn't know how to answer the woman.

5. Why did the woman say "Lie down in the middle of the street and you'll soon be sent to a hospital. " in

    Paragraph 4?

    A. She thought it's the best way to get to the nearest hospital.

    B. She didn't understand what the farmer asked.

    C. She was making a joke.

    D. She didn't want to talk with the farmer.

题型:单项选择题

计算题:某供电营业所有三条出线。某月甲线供电量为180000kW·h,售电量为172000kW·h;乙线供电量为220000kW·h,售电量为209000kW·h;丙线为无损户,供电量为400000kW·h。试求该供电营业所当月总线损率为多少?若扣除无损户后总线损率为多少?

题型:单项选择题

何谓湿阻

题型:单项选择题

某化学小组为了测定石膏(CaSO4·xH2O)的组成,即测定x值,做如下实验:将石膏加热使之脱水,加热过程中固体的质量与时间的变化关系如右图所示。数据表明当固体的质量为2.72 g后不再改变。求(必须写出计算过程):

(1)石膏的化学式。

(2)图象中AB段对应化合物的化学式。

题型:单项选择题

功夫茶产生于哪里?

更多题库