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根据材料,回答题。 Will We Take Vacation in Spaces? When Mike Kelly first set out to build his own private space,ferry service, he figured his bread-and-butter business would be lofting Satellites into high-Earth orbit. Now he thinks he may have figured wrong. 'People were always asking me when they could go,' says Kelly, who runs Kelly Space Technology out of San Bernardino, California. 'I realized that real market is in space tourism. ' According to preliminary market surveys, there are 10,000 would-be-space-tourists willing to s, pend $ 1 million each to visit the final frontier. Space Adventure in Arlington, Virginia, has taken more than 130 deposits for a two-hour, $ 98,000 space tour tentatively (and somewhat du biously) set to occur by 2005. Gene Meyers of the Space Island Group says: 'Space is the next exotiC.vacation spot. ' This may all sound great, but there are a few hurdles. Putting a simple satellite into orbit with no oxygen, life support or return trip necessary already costs an astronomical $ 22,000/kg. And that doesn't include the cost of .insuring rich and possibly litigious passenger. John Pike of the Federation of American Scientists acerbieally suggests that the entire group of entrepreneurs trying to corner the space tourism market have between them 'just enough money to blow up one rock et. ' The U.S. space agency has plenty of money but zero interest in making space less expensive for the little guys. So the little guys are racing to do what the government has failed to do: design a reusable launch system that's inexpensive, safe and reliable. Kelly Spaee's prototype looks like a plane that has sprouted rocket engines. Rotary Rocket in Redwood City, California, has a booster with rotors make a helicopter-style. return.to Earth; Kistler Aerospace in Kirkland, Wash ington, is piecing together its versions from old Soviet engines, shuttle-style. thermal protection tiles and an' elaborate parachute system. The first passenger countdowns are still years away, but bureaucrats at the Federal Aviation Administration in Washington are already informally discussing fligh.t regulations. After all, you can't be too prepared for a trip to that galaxy far, far away.are plotting to build space hotels. Before the Russian space Mir came down, some people were talking about using it as a low-rent space hotel to reduce the cost. If a space hotel is finally built in space, and if you're thinking of staying in it, you may want to check the Michelin ratings before booking your- self a suite. Mike Kelly planned to turn his business of making bread and butter into a business that is engaged in space tourism. 查看材料
A.
Right
B.
Wrong
C.
Not mentioned
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A.
B.
C.
D.
【多选题】防治骨质疏松的药物按照作用机制可分为
A.
抑制骨吸收
B.
钙剂
C.
维生素D
D.
双膦酸盐
E.
维生素A
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A.
抑制肾小管对钙重吸收
B.
抑制前列腺素的分解
C.
可抑制肠道转运钙
D.
有明显的镇痛作用
E.
直接抑制破骨细胞的活性
【单选题】but those living in the forest are already in the
A.
cave
B.
shade
C.
sunshine
D.
open
【简答题】IEEE802.3标准的MAC子层采用介质访问控制方法是( )。
【多选题】以下哪些抑制钙的吸收( )
A.
草酸
B.
植酸
C.
肠道酸性环境
D.
可乐型饮料
【单选题】一般在管道分岔、拐弯、变径、末端、阀门位置和直管处,每隔一定距离应设置( )。
A.
四通
B.
三通
C.
镇墩
D.
直通
【判断题】全景相机只能手持?
A.
正确
B.
错误
【单选题】甲向乙发出要约,乙于 3 月 8 日发出承诺信函, 3 月 10 日承诺信函寄至甲,但甲的法定代表人当日去赈灾, 3 月 11 日才知悉该函内容,遂于 3 月 12 日致函告知乙收到承诺,该承诺的生效时间是( )。
A.
3 月 8 日
B.
3 月 10 日
C.
3 月 11 日
D.
3 月 12 日
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