搜题请搜索小程序“爱下问搜题”
问题 单项选择题

2003～2007年间，SCI收录中国科技论文数的年均增长率约为（）

A．6%

B．10%

C．16%

D．25%

答案

参考答案：C

解析：

本题属于计算题。2003-2007年间SCI收录总过科技论文的数的年平均增长率为[(89147-49788) ÷5]≈16%,所以选择C。

单项选择题

唐朝中央刑事案件的复核机关是( )。

A．御史台

B．大理寺

C．都察院

D．刑部
查看答案
单项选择题

Space travel is definitely bad for astronauts’ bones, reducing their bone density after only a month of weightlessness, according to French research published on Friday.
Laurence Vico and his fellow workers at St Etienne University called for more research into the effects of microgravity, after their study of 15 astronauts from the Russian MIR station showed bone loss continued throughout space flights.
"Bone loss was especially striking in four astronauts, " the scientists reported in the Lancet Medical Journal.
They measured the Bone Mineral Density (BMD) of bones in the forearm and lower leg of the astronauts who had spent one to six months in space.
The BMD loss was significant in the tibia of the lower leg, a weight-bearing bone, but barely changed in the radius of the forearm. "Our results indicate the need to investigate not only different bones, but also different areas of the same bone since not all sites of the skeleton are similarly affected by space conditions, " they added.
Without gravity the body isn’t bearing any weight so there is no need for calcium which makes bones p, and it becomes empty into the bloodstream.
The research team suggested in future scientists should try to determine if the loss of bone density was only on weight-bearing bones on longer flights, also the possible recovery after returning to Earth.

In the third paragraph, the word "striking" means ______.

A. unusual



B. simple
C. weak



D. slow
查看答案