"I worked a bit with NASA engineers," says Voss, "but I did it mostly by analysis. I used a handheld calculator, not a computer, to do a thermodynamic(热力学的) analysis." At the end of the summer, he, like the other NASA-ASEE fellows working at Marshall, summarized his findings in a formal presentation and detailed paper. It was a valuable moment for Voss because the ASEE program gave him added understanding of NASA, deepened his desire to fly in space, and intensified his application for astronaut status.
It was not an easy process. Voss was actually passed over when he first applied for the astronaut program in 1978. Over the next nine years he reapplied repeatedly, and was finally accepted in 1987. Since then he has participated in three space missions. The 50-year-old Army officer, who lives in Houston, is now in training for a four-month mission as a crew member on the International Space Station starting in July 2000.
Voss says the ASEE program is wonderful for all involved. "It brings in people from the academic world and gives NASA a special property for a particular period of time. It brings some fresh eyes and fresh ideas to NASA, and establishes a link with our colleges and universities," Voss explains. "There's an exchange of information and an exchange of perspectives that is very important."
For the academic side, Voss says, "the ASEE program also brings institutions of higher learning more insight into new technology. We give them an opportunity to work on real world problems and take it back to the classroom."
Why was the hydraulic fuel pump seal important for the space shuttle?
A.Because previous seals all failed.
B.Because it was very complex in running the space program.
C.Because great care has to be taken of the hydraulic fuel pump sealing.
D.Because any crack in the seals would cause disastrous results for the astronauts.
第1题
丙型肝炎病毒下列哪项叙述不正确
A.为单股正链RNA病毒
B.可应用血源疫苗免疫以预防感染
C.血清中检测出anti-HCV提示有感染
D.血清中可检测病毒RNA
E.绝大多数为血源传播
第2题
丙型肝炎病毒下列哪项叙述不正确
A.为单股正链RNA病毒
B.可应用血源疫苗免疫以预防感染
C.血清中检测出anti-HCV提示有感染
D.血清中可检测病毒RNA
E.绝大多数为血源传播
第3题
关于丙型肝炎病毒,下列哪项叙述不正确
A.为单股正链RNA病毒
B.可应用血源疫苗免疫以预防感染
C.血清中检测出抗一HCV提示有感染
D.血清中可检测病毒RNA
E.绝大多数为血源传播
第4题
关于丙型肝炎病毒,下列哪项叙述不正确
A、为单股正链RNA病毒
B、可应用血源疫苗免疫以预防感染
C、血清中检测出抗-HCV提示有感染
D、血清中可检测病毒RNA
E、绝大多数为血源传播
第5题
A、为单股正链RNA病毒
B、可应用血源疫苗免疫以预防感染
C、血清中检测出Anti-HCV提示有感染
D、血清中可检测病毒RNA
E、绝大多数为血源传播
第6题
关于丙型肝炎病毒,下列哪项叙述不正确
A.为单股正链RNA病毒
B.抗HCV是否转阴不反映抗病毒疗效
C.血清中检测出anti—HCV提示有现症感染
D.血清中可检测病毒RNA
E.绝大多数为血源传播
第7题
丙型肝炎病毒为
A.单股线状DNA病毒
B.双股DNA病毒
C.单股环状闭合RNA病毒
D.单股贫链RNA病毒
E.单股正链RNA病毒
第8题
流行性出血热病毒是()。
A.一种DNA病毒
B.单股正链RNA病毒
C.与丙型肝炎病毒一样
D.与艾滋病毒(HIV)相同属反转录病毒科
E.汉坦病毒属,为单股负链RNA病毒
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