剪切变形的受力特点是()。A、杆件受一对等值、反向、共线的力 B、杆件受一对等值、反向

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问题:

剪切变形的受力特点是()。

A、杆件受一对等值、反向、共线的力

B、杆件受一对等值、反向、作用线相距很近且与轴线垂直的力

C、杆件受一对等值、同向、作用线互相平行且相距很近的力

D、杆件受一对等值、作用线相交的力

考点:钻井柴油机工钻井柴油机工(高级)钻井柴油机工(高级)题库
题型:单项选择题
对于a×
5
8
=b×6
6
5
=c×
5
4
,a、b、c中最大的数是(  )(a、b、c均不为0)
A.bB.aC.c
题型:单项选择题

Diao Weihao, a student who studies business English at the Chengdu campus of Sichuan International Studies University, was in his dormitory when the earthquake struck at 2:30 pm on Monday.

The 22-year-old felt that his chair was shaking. All of a sudden, the textbooks on the bookshelf began to fall to the floor. The glass in the window broke.

“It felt like our dormitory building was being hit by a tractor,” recalled Diao. “I wasn’t afraid.. I was even excited and curious. Now, looking back, it was a scary experience.”

Diao and his roommates kept their calm. They didn’t try to get out of the building until the shaking stopped. They were on the fifth floor and they feared there might be trouble if they didn’t remain calm.

“We’ve watched lots of disaster films, and that helped us keep cool,” he said. “Only one student sprained(扭伤) his ankle. He was escaping in a hurry. Most of us got outside quickly and safely.”

They were surprised to see so many students outside.

“I began to realize then what had happened,” he said. The college had warned them that in the event of an earthquake, they should leave the dormitory immediately. A few did rush in when it was safe to grab some clothes to keep warm.

Without any tents or bedding, the students stayed on the football field for the whole night. Rain started falling in the morning, but the students all kept in good order. They simply chatted and shared their feelings and comforted each other.

“Our students seemed to have self-control,” he said. “I heard that hospitals in Chengdu have lots of injured people who jumped out of buildings.”

Now, Diao is mostly worried about the people in Wenchuan County.

“It seems we won’t be able to have classes in one or two day’s time,” said Diao. “I want to become a volunteer at the damage-hit area, or donate my blood to the injured people in hospital. Also, I will write on my blog to keep people calm and encourage them to protect themselves during emergencies.”

Since the university is close to Dujiangyan, Diao and his classmates are still forbidden to return to their dorms or classrooms. However, they can eat in the canteen and get information about other parts of Sichuan by reading the newspapers.

小题1:Where was Diao Weihao when the earthquake happened?

A.He was in the campus.

B.He was in the football field.

C.He was in his dormitory

D.He was in his classroom.小题2:What did Diao Weihao feel when he realized what was happening?

A.Afraid

B.Interesting

C.Moved

D.Calm小题3:When did Diao Weihao and his classmates rushed outside?

A.During the quake

B.The moment they realized what was happening

C.After the quake

D.When they got warnings.小题4:Rearrange the following events in the proper order according to the passage.

a. They got out of buildings safely.

b. Diao Weihao was in his dormitory.

c. Diao Weihao wanted to be a volunteer.

d. Many classmates went out of the building.

e. An earthquake happened.

f. They stayed on the football field for the whole night.

A.b→e→a→d→f→c

B.b→e→d→a→f→c

C.e→a→b→d→c→f

D.f→a→c→f→e→d小题5:From this passage, we know that Diao Weihao and his classmates are _________.

A.energetic and strong in will

B.wise and caring

C.hardworking and learned

D.helpful and honest

题型:单项选择题

设D是xOy平面上以(1,1)、(-1,1)和(-1,-1)为顶点的三角形区域,D1是D在第一象限的部分,等于()。

A.A

B.B

C.C

D.D

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