直角刚杆AO=2m,BO=3m,已知某瞬时A点的速度vA=6m/s,而B点的加速度与

题型:单项选择题

问题:

直角刚杆AO=2m,BO=3m,已知某瞬时A点的速度vA=6m/s,而B点的加速度与BO成β=60°角,则该瞬时刚杆的角加速度α为()rad/s2

A.A

B.B

C.C

D.D

考点:一级注册结构工程师一级结构师基础知识一级注册结构工程师基础部分上午试卷
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短文填空

Reading is an activity that people enjoy a lot in their free time.

Some like reading newspapers and o___小题1:__ enjoy novels or comic(喜剧的)books. My f__小题2:___ books are those about the lives of great people. Reading them always gives me a lot of ideas on how to make my o___小题3:___ life better.

Great people are remembered not because they were handsome or beautiful, but because they did not give up w___小题4:___ their lives were difficult. They tried to use e___小题5:___ chance to change their lives and make the world better.

One good example is Orville and Wilbur Wright, the two brothers who invented the airplane. The plane has m___小题6:____ the world a small village. Hard work, not good luck, is the r___小题7:___ why the Wright Brothers could invent this convenient(方便的)machine and become great people. Today we will remember them when we see planes f___小题8:____ in the sky.

Whenever I read s___小题9:___ about great people, I always learn a lot from them and they encourage me to march on.

This is w___小题10:___ I enjoy reading about great people’s lives.

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下图为“我国某中等城市常住人口数量与距市中心远近的关系图”。读图完成1—2题。

1.①区域常住人口数量较少的主要原因是该区域 [     ]

A.环境极差

B.设施不全

C.交通不便

D.地价太高

2.③区域可能属于 [     ]

A.工业区

B.商业区

C.住宅区

D.行政区

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患者,女,24岁。有“抑郁病”史。现神思恍惚,心悸易惊,善悲欲哭,肢倦乏力,纳少,舌淡,脉细无力。辨证为癫病,其治则为()。

A.理气解郁,化痰开窍

B.益气健脾,涤痰宣窍

C.益气健脾,养心安神

D.补气养血

E.滋补肝肾

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钢梁常用基本钢材有哪些?

题型:单项选择题

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病灶定位在()

A.优势半球额中回后部

B.优势半球额下回后部

C.优势半球颞中回后部

D.优势半球颞上回后部

E.优势半球角回

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