矿井主要通风机的工作风量怎样测定?

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问题:

矿井主要通风机的工作风量怎样测定?

考点:煤矿矿井测风测尘工煤矿矿井测风测尘工题库
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She was reported by the hospital spokesman _____ excellent progress.

A.to make

B.to be making

C.made

D.having made

题型:问答题 简答题

高抬下肢可增强、坐位或立位可减弱或消失的心音是()。

A.第一心音

B.第二心音

C.第三心音

D.第四心音

E.第五心音

题型:问答题 简答题

阅读下列短文,从每题所给的四个选项(A、B、和D)中,选出最佳选项,并在答题卡上将该项涂黑。

One of Britain’s bravest women told yesterday how she helped to catch suspected police killer David Bieber --- and was thanked with flowers by the police. It was also said that she could be in line for a share of up to £30,000 reward money .

Vicki Brown , 30 , played a very important role in ending the nationwide manhunt . Vicki , who has worked at the Royal Hotel for four years , told of her terrible experience when she had to steal into Bieber’s bedroom and to watch him secretly. Then she waited alone for three hours while armed police prepared to storm the building.

She said : “ I was very nervous . But when I opened the hotel door and saw 20 armed policemen lined up in the car park I was so glad they were there.”

The alarm had been raised because Vicki became suspicious of the guest who checked in at 8 pm the day before New Year’s Eve with little luggage and wearing sunglasses and a hat pulled down over his face. She said : “ He didn’t seem to want to talk too much and make any eye contact.” Vicki, the only employee on duty , called her boss Margaret , 64 , and husband Stan McKale, 65 , who phoned the police at 11 pm.

Officers from Northumbria Police called Vicki at the hotel in Dunston , Gateshead , at about 11:30 pm to make sure that this was the wanted man . Then they kept in touch by phoning Vicki every 15 minutes.

“ It was about ten to two in the morning when the phone went again and a policeman said ‘ Would you go and make yourself known to the armed officers outside ?’ My heart missed a beat .”

Vicki quietly showed eight armed officers through passages and staircases to the top floor room and handed over the key.

“ I realized that my bedroom window overlooks that part of the hotel , so I went to watch . I could not see into the man’s room , but I could see the passage . The police kept shouting at the man to come out with his hands showing . Then suddenly he must have come out because they shouted for him to lie down while he was handcuffed(带上手铐).”

小题1:Vicki became suspicious of David Bieber because ____________ .

A.he looked very strange

B.the police called her

C.he came to the hotel with little luggage

D.he came to the hotel the day before New Year’s Eve小题2:Vicki’s heart missed a beat because __________ .

A.the phone went again

B.she could be famous

C.she saw 20 policemen in the car park

D.she would lead the policemen to catch the man小题3:David Bieber was most probably handcuffed in ____________.

A.Vicki’s bedroom

B.the street

C.the passage

D.the yard小题4:How long did the whole event probably last from the moment Bieber came to the hotel to the arrival of some armed officers ?

A.About 6.

B.About 8.

C.About 11.

D.About 14

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不定项选择
下列对增透膜的叙述,你认为不正确的是(   )
A.摄像机的镜头上涂一层增透膜后,可提高成像质量

B.增透膜是为了增加光的透射,减少光的反射

C.增透膜的厚度应为入射光在薄膜中波长的

D.增透膜的厚度应为入射光在真空中波长的

题型:问答题 简答题

机舱由()和()组成,底盘上安装除了控制器以外的主要部件。机舱罩后部的上方装有(),舱壁上有()装置等,底部与塔架连接。

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