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【单选题】

Human Space Exploration
While scientists are searching the cause of the Columbia disaster, NASA is moving ahead with plans to develop a new craft that would replace shuttles (航天飞机) on space station missions by 2012 and respond quickly to space station emergencies.
The space agency released the first set of mission needs and requirements several days ago for me orbital space plane (轨道航天飞机), which would be designed to transport a crew of four to and from the International Space Station.
Although it includes few specifics, the plan states the orbiter (轨道航天飞机) will be safer cheaper and require less preparation time than the shuttle. It would be able to transport four crew members by 2012 though it would be available for rescue missions by 2010. NASA says the craft should be able to transport injured or ill space station crew members to "definitive (决定性的) medical care" within 24 hours.
The release of the requirements showed NASA remains focused on the long-term priorities of space exploration, even as questions exist concerning the loss of Columbia and its seven member crew on February 1, 2003.
Expels at Marshall Space Flight Center in Huntsville, Alabama, have been working for years on a successor to the shuttle. The project, known as the Space Launch Initiative (倡议), was divided last year into two parts one focusing on a future launch vehicle, the other on a space station orbiter. The orbiter is expected to be ready sooner.
The program’s managers say NASA officials have told them not to alter Space Launch Initiative in light of the Columbia disaster.
U.S. President George W. Bush asked Congress for about US$1 billion for Space Launch Initiative in 2004, funds that would be almost equally split between the Orbital Space Plane and Next Generation Launch Technology.
Human Space ExplorationNASA plans to design the new space craft to ______.

A.
control the International Space Station
B.
carry astronauts to the International Space Station
C.
transport equipment to the International Space Station
D.
train astronauts in space flights
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【单选题】sp1杂化轨道的几何构型是()

A.
直线形
B.
平面三角形
C.
正四面体形
D.
锥形

【单选题】世界上第一架航天飞机的名称叫()

A.
和平号
B.
挑战者号
C.
太阳神号
D.
哥伦比亚号

【多选题】无砟轨道

A.
无砟轨道与有砟轨道相比,无砟轨道养护维修工作量小,结构耐久性好,轨道使用寿命长(60年以上) 。
B.
初期土建工程投资相对较小,节省工程总造价。
C.
无砟轨道与有砟轨道相比,无砟轨道养护维修工作量小,结构耐久性好,轨道使用寿命长(50年以上) 。初期土建工程投资相对较小,节省工程总造价。
D.
无砟轨道与有砟轨道相比,无砟轨道养护维修工作量小,结构耐久性好,轨道使用寿命长(60年以上) 。初期土建工程投资相对较小,节省工程总造价。

【单选题】下列关于药物稳定性加速试验的叙述中,正确的是

A.
试验温度为40±2℃
B.
进行加速试验的供试品要求三批,且为市售包装
C.
试验时间为1、2、3、6个月
D.
试验相对湿度为75%±5%
E.
A、B、C、D均是