目前有哪些新的节能建筑材料和技术?您能说出其中的3项吗?

题型:问答题 简答题

问题:

目前有哪些新的节能建筑材料和技术?您能说出其中的3项吗?

考点:节能减排知识竞赛节能减排知识竞赛题库
题型:问答题 简答题

众数能够反映一组数的集中情况。 [ ]

题型:问答题 简答题

《汽车制动传动装置修理技术条件气压传动》(GB/T18275.1—2000)规定了空气压缩机修理过程中对各主要零部件检验的技术要求,包括汽缸镗磨后缸筒表面的()。

A.圆度

B.圆柱度

C.表面粗糙度

D.垂直度

题型:问答题 简答题

胰腺癌最常见的组织类型为

A.腺泡细胞癌

B.导管细胞癌

C.多形性腺癌

D.纤维细胞腺癌

E.黏液癌

题型:问答题 简答题

变压器在空载运行时,电网电压的波形为正弦波,若铁芯不饱和,空载电流的波形是();若铁芯饱和,励磁电流的波形是()。

A.尖顶波;正弦波

B.正弦波;正弦波

C.尖顶波;尖顶波

D.正弦波;尖顶波

题型:问答题 简答题

Astronaut Jim Voss has enjoyed many memorable moments in his career, including three space flights and one space walk. But he recalls with special fondness a decidedly earthbound experience in the summer of 1980, when he participated in the NASA-AS-EE Summer Faculty Fellowship Program. Voss, then a science teacher at West Point, was assigned to the Marshall Space Flight Center’s propulsion lab in Alabama to analyze why a hydraulic fuel pump seal on the space shuttle was working so well when previous seals had failed. It was a seemingly tiny problem among the vast complexities of running the space program. Yet it was important to NASA because any crack in the seals could have led to destructive results for the astronauts who relied on them.

"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 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 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. \

What does Voss want to stress in the last paragraph ?()

A. The technological significance of the program.

B. The educational significance of the program.

C. The philosophical significance of the program.

D. The historical significance of the program.

更多题库