听力原文: M: Did you know that astronauts have made commercial products in space?
W: No. I wasn't aware of that. What kind of products?
M: Tiny plastic beads.
W: Beads? Do you mean to tell me that astronauts have nothing better to do than make jewelry beads in space? It seems to me that they can make more useful things out there.
M: Oh ! But these plastic beads aren't for jewelry. They can be used for many scientific purposes, from conducting cancer research to calibrating microscopes.
W: That sounds better. But why make such objects in space rather than on earth?
M: Because earth’s gravitational pull affects the beads. The beads produces on earth are distorted not exactly round. The ones made in space are precise spheres.
What are the speakers mainly discussing?
A.Astronauts' clothing.
B.Products made in space.
C.Costume jewelry.
D.Problems in manufacturing.
第1题
休克病人血容量基本补足后,尿量仍少于20ml/h,尿比重低,此时应考虑()
A、心功能不全
B、急性肾衰竭
C、血管升压素分泌过多
D、代谢性酸中毒
E、低渗性脱水
第2题
休克病人血容量基本补足后,尿量仍少于20ml/h,尿比重低,此时应考虑
A.心功能不全
B.急性肾功能衰竭
C.抗利尿激素分泌过多
D.代谢性酸中毒
E.低渗性脱水
第6题
休克病人血容量补足后仍尿少、尿比重低,应考虑
A、心功能不全
B、肝功能不全
C、肾功能不全
D、肺功能不全
E、麻黄碱
第8题
休克病人血容量补足后仍尿少、尿比重低,应考虑()
A.心功能不全
B.肺功能不全
C.肾功能不全
D.肝功能不全
E.抗利尿激素分泌过多
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