问题 选择题

我国自主研制的“嫦娥三号”,携带“玉兔”月球车已于2013年12月2日1时30分在西昌卫星发射中心发射升空,为了在既定时间、既定地点准确着陆,“嫦娥三号”需要进行约8天的绕月飞行,设“嫦娥三号”绕月匀速飞行的轨道半径为R,已知月球质量为m,引力常量为G,以下说法正确的是(  )

A.“嫦娥三号”绕月飞行速度为

R
Gm

B.“嫦娥三号”绕月飞行角速度为

R3
Gm

C.“嫦娥三号”绕月飞行加速度为

Gm
R2

D.“嫦娥三号”绕月飞行周期为2π

R3
Gm

答案

根据万有引力提供向心力G

mm
R2
=m
v2
R
=mω2R=ma=m
4π2
T2
R,解得v=
Gm
R
ω=
Gm
R3
a=
Gm
R2
T=2π
R3
Gm
,故ABC错误、D正确.

故选:D.

完形填空

From bankers to factory staff, employees in the west face the bleak prospect of losing their jobs as a global recession starts to bite. For colleagues in the East the pain is more likely to come through a pay cut.

Human resource experts say cultural differences explain why Asian firms try harder to keep jobs in difficult times, which will stop unemployment and may help keep Asian economies afloat at a time of slowing exports.

The East Asian attitude may also make it easier for firms to recover quickly from the economic downturn since they will not need to rehire or train new staff, leaving some experts predicting Western shift to Eastern flexibility.

“In the Confucian attitude, the right thing to do is to share the burden. There is the sense of collective responsibility whereas in the west, it’s more about the individual survival,” said Michael Benotlel, associate professor of organizational behavior at Singapore Management University.

Steven Pang, Asian Regional director for Aquent, a headhunting firm, said in many East Asian companies there was an responsibility “ to take care of the members of the family and go through the pain together” even if that meant causing losses.

Us firms from General Motors to Goldman Sachs plan to lay off workers by the thousands. But at the Asian units of Western multinationals, jobs cuts will probably be less severe.

Japan’s jobless rate was 4 percent in September, up from 3.8 percent in January, while Hong Kong’s was flat at 3.4 percent. But US unemployment is expected to have jumped to 6.3 percent last month from below 5 percent in January.

Experts say that while there are noticeable differences in labor practices in East

and West, the gap will narrow as more firms become more multinational and competition forces firms to adopt the best practices of rivals from abroad.

小题1:According to the passage, what does “to share the burden” mean?

( less than 6 words)

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小题2: Why would firms in the west lay off workers when facing a bleak prospect?

( no more than 5 words)

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小题3:Why is it easier for the East Asian firms to recover quickly from the economic downturn? (no more than 12 words)

____________________________________________________________________

小题4:What’s the passage talking about? (no more than 15 words)

____________________________________________________________________

单项选择题