首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A project likely to evolve in. the near or intermediate future is space tourism, a purely【B1】______ activity that would not have
A project likely to evolve in. the near or intermediate future is space tourism, a purely【B1】______ activity that would not have
admin
2010-06-11
36
问题
A project likely to evolve in. the near or intermediate future is space tourism, a purely【B1】______ activity that would not have to rely on unpredictable government decisions. It would 【B2】______ put space operations on a much more solid, dependable footing and would enormously【B3】______ man’s space activity. While some people see space tourism as a【B4】______ multibillion-dollar business, difficult technical problems remain to be【B5】______
First, a manned reusable rocket like the Venture Star must be built. Then, a second serious problem must be【B6】______ : even today’s most-advanced space rockets are able to【B7】______ only about 2.5% of their launch weight into orbit-- a ratio that has hardly changed in the last 40 years. This fact is a result of the【B8】______ of material characteristics and chemical power sources, and【B9】______ .
Today the price of a ticket to space would have to be at least $ 50 000. It is questionable【B10】______ . However, space tourism may become more attractive once space facilities are built【B11】______ .
【B1】
选项
答案
commercial
解析
转载请注明原文地址:https://kaotiyun.com/show/atKK777K
0
大学英语六级
相关试题推荐
A、Factorsthataffecttheabilitytomemorize.B、Theinfluenceofchildhoodmemoriesonadulthood.C、Aproposalforfuturepsych
Thatexperiencesinfluencesubsequentbehaviorisevidenceofanobviousbutneverthelessremarkableactivitycalledremembering
A、Industry.B、Health.C、Thefutureofourchildren.D、Cleanair.AAccordingtothepassage,whatdoesmanvalueamongthefollow
Fromthepassage,whichisthemaininfluencefactorinthefuture?Fromthepassage,welearnpeoplewillhavetokeepworking
Badeatinghabits,increasedfoodavailability,increasinglysedentarylifestyleandreducedphysicalactivityarethefirstfou
Badeatinghabits,increasedfoodavailability,increasinglysedentarylifestyleandreducedphysicalactivityarethefirstfou
随机试题
手工电弧焊在工作过程中的安全注意事项有哪些?
宗教领袖所具有的权威通常来自()。
根据我国民法的有关规定,因紧急避险造成损害的,如果险情是由于人为的原因引起的()
某建设项目甲建设单位与乙施工单位签订施工总承包合同后,乙施工单位经甲建设单位认可将打桩工程分包给丙专业承包单位,丙专业承包单位又将劳务作业分包给丁劳务分包单位,由于丙专业分包单位从业人员责任心不强,导致该打桩工程部分出现质量缺陷,对于该质量缺陷的责任承担,
长期坚持负重深蹲练习,但是不能得到充分锻炼的肌肉是()。
张先生向商店订购某种商品80件,每件定价100元。张先生向商店经理说:“如果你肯减价,每减1元,我就多订购4件。”商店经理算了一下,如果减价5%,由于张先生多订购,仍可获得与原来一样多的利润。则这种商品每件的成本是:
“元四家”指的是_______、_______、_______、_______。
下列说法中,正确的是()。
ThediscoveryoftheAntarcticnotonlyprovedoneofthemostinterestingofallgeographicaladventures,butcreatedwhatmigh
Whichofthefollowingdatesareavailableforthewomanandherhusband’sholiday?
最新回复
(
0
)