问题 单项选择题

()是在摩擦副两个摩擦面之间,没有足够厚度的油膜,只有吸附在摩擦表面上的一层极薄的油性膜,载荷几乎全部通过表面微凸体的变形来承受。

A、流体润滑

B、混合润滑

C、边界润滑

D、不确定

答案

参考答案:C

阅读理解

People's Daily Online    07:57, March 13, 2014

According to "China’s Economic Life Survey 2013-2014", reported by CCTV (China Central Television) on March 4, 20 cities in China has been chosen as the happiest cities in the country. The China’s Economic Life Survey, sponsored by CCTV, the National Bureau of Statistics, China Post Group Corporation and National School of Development at Peking University, is China's largest national media and public survey. More than 100,000 families across 300 counties and 104 cities took part in this nationwide questionnaire(问卷调查). The survey focused on the income, expenditure, social security, and life quality.

Here are the top 20 happiest cities in China.

Haikou, Hainan Province, Changsha, Hunan Province ,Taiyuan, Shanxi Province ,Nanjing, Jiangsu Province ,Tianjin, Hefei, Anhui Province, Chongqing ,Hohhot, Inner Mongolia Autonomous Region, Hangzhou, Zhejiang Province, Xining, Qinghai Province, Lhasa, Tibet Autonomous Region,Qinhuangdao, Hebei Province,Yongzhou, Hunan Province, Yichun, Heilongjiang Province ,Huangshan, Anhui Province ,Huzhou, Zhejiang Province,Chuzhou, Anhui Province,Mianyang, Sichuan Province ,Shangrao, Jiangxi Province,Bozhou, Anhui Province.

小题1:Maybe the passage is from a/an ______.

A.ad

B.newspaper

C.textbook

D.story小题2:_____cities in Anhui are mentioned in the passage.

A.Three

B.Four

C.Five

D.Two小题3:According to the passage, no city in _____ is chosen as the top 20 happiest cities in China.

A.Zhejiang Province

B.Jiangxi Province

C.Shanxi Province

D.Hubei Province

单项选择题