女性慢性淋病引起不孕的主要原因是（） A.急性输卵管炎 B.子宫内膜炎 C.输卵管卵

南北半球分别有一物体自西向东运动，下列有关其偏向的叙述正确的是(    )

A．都向低纬偏转

B．都向高纬偏转

C．都向南偏转

D．北半球向北偏转，南半球向南偏转

古希腊爱奥尼柱式的卷窝是有（）圆心的螺线

在信用证支付方式下，外贸单证工作主要有（）等方面的内容，它贯穿于合同履行的全过程。

A、审证

B、制单

C、审单

D、交单

E、存档

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

L公司于2006年末委托某运输公司向某企业交付一批产品。由于验收时发现部分产品有破损，该企业按照合同约定要求L公司采取减价等补偿措施或者全部于以退货，L公司以产品破损是运输公司责任为由而拒绝对方要求。由于发货前已收到该企业预付的全部货款，L公司于2006年确认丫相应主营业务收入。( )