已知某材料的弹性模量E=200GPa，泊松比 ，则其切变模量为（）。

A、A

B、B

C、C

D、D

A、放缝

B、倒角

C、打剪口

D、钻孔

A、5000欧姆

B、1005欧姆

C、995欧姆

D、200欧姆

The following paragraph is taken from a student’s school application letter. What aspect of personal information is it about? I have recently completed my PhD in “Health Disparities and the impact of Social Class on Clinical Outcomes’ at the University of Chicago. My PhD involved primary research with clinicians and patient advocates and culminated in a set of recommendations for local Clinical Commissioning Groups. Prior to that I completed a Master in Public Health at Oxford University, where I gained a distinction.

A、Work experience

B、Personality

C、Education background

D、Hobbies

A、

B、

C、

D、

A、吸液芯热管

B、旋转热管

C、重力式热管

D、换热管

图示结构中杆1、2的内力为：

A、

B、

C、

D、

A、中通快递

B、顺丰

C、百世汇通

D、韵达快递