切断机断料时,手与刀口的距离不得小于()。活动刀片行进时严禁送料。 A.100mm

题型:单项选择题

问题:

切断机断料时,手与刀口的距离不得小于()。活动刀片行进时严禁送料。

A.100mm

B.150mm

C.250mm

D.350mm

考点:机械知识机械知识题库
题型:单项选择题

阅读短文,选择正确答案。

      These days, most people in Britain and the US do not wear formal (正式的) clothes. But sometimes it is

important to wear the right thing. Many British people don't think about clothes very much. When they go out to

enjoy themselves, they can wear almost anything. At theatres (剧院), cinemas and concerts (音乐会) you can

put on anything you like: from beautiful suits and dresses to jeans and sweaters. Anything goes, as long as you

look clean and tidy. But in Britain, as well as in the US, men in offices usually wear suits and ties and women

wear dresses or skirts (not trousers). Doctors and business people always wear quite formal clothes. And in

some hotels and restaurants men have to wear ties and women have to wear tidy dresses. 

      In many ways, Americans are less formal than British people, but they are more careful with their clothes.

At home, or on holiday, most Americans wear informal (非正式的) or sports clothes. But when they go out in

the evening, they like to look nice. In good hotels and restaurants, men have to wear jackets and ties, and women

have to wear pretty clothes. 

      It is difficult to say exactly (确切地) what people wear in Britain and the US, because everyone is different.

If you are not sure what to wear, watch what other people do and then do the same. You'll feel good if you

don't look too different from everyone else.

1. The best title (题目) for this passage (文章) would be _______. [ ]

A. What British and American people wear nowadays (现在) 

B. Office manners (习俗) in Britain and the US 

C. Differences between British and American business men 

D. No trousers for office ladies

2. People in Britain and the US wear informal clothes when they _______. [ ]

A. go out to enjoy themselves

B. are in offices 

C. are in big restaurants

D. go out to work

3. At concerts British business people wear _______. [ ]

A. sweaters

B. anything they like 

C. suits and ties

D. clothes like players

4. Which of the following is True according to the passage? [ ]

A. Women are usually not allowed (允许) to wear trousers in offices. 

B. Lawyers (律师) always wear formal clothes even though (即使) they are at home. 

C. British people are more careful with their clothes than American people. 

D. Though everyone is different, they wear the same clothes in offices.

5. Women in Britain and the US have to wear tidy (整洁的) dresses EXCEPT _______. [ ]

A. when they are having dinner in some top restaurants 

B. when they are in offices 

C. when they are attending (参加) a party in a nice hotel 

D. when they are meeting friends at home

题型:单项选择题
已知tan2α=
3
4
,α∈(-
π
2
π
2
),当函数f(x)=sin(x+α)+sin(α-x)-2sinα
的最小值为零时,求cos2α及tan
α
2
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