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10[填空题]

若向量组α1,α2,α3与向量组β1,β2,β3等价,其中β1=(1,0,0,0)T,β2=(0,1,0,0)T,


β3=(1,1,0,0)T,则向量组α1,α2,α3的秩为____


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  • 题干Tabetha Adventure Centre Open April to October Deep in the heart of the Brecon Beacons in Wales, Tabetha Adventure Centre offers you the chance (1)回答ABCD something wildly different for your holidays this year. The rivers and lakes of this remote wilderness area allow us (2)回答ABCD a range of water-based activities: * Solo canoe – training is given in (3)回答ABCD canoes; then you go solo in the last days of the course. * White-water rafting - four to a raft, you will enjoy the experience and friendship of working together to pilot these tiny crafts through rapid rivers and (4)回答ABCD currents. * Sailing and yachting courses are also (5)回答ABCD  for beginners and more (6)回答ABCD sailors on the beautiful natural lakes. The mountains and cliffs also offer a (7)回答ABCD range of opportunities: * day hiking and overnight wild camping * rock climbing for all levels of ability * bungee jumping * birdwatching in the high peaks Finally, for the really adventurous , our one-week parachute preparation course, (8)回答ABCD to a jump where you come in over the Atlantic Ocean and land (9)回答ABCD the beach. And for the really tough, we run a five-day or ten-day survival skills course - to prepare you (10)回答ABCD whatever life brings.   1. A. doing                 B. to do             C. to be done            D. to be doing 2. A. offered              B. offer              C. to offer                  D. to be offered 3. A. two persons    B. two-persons         C. two person’s                 D. two-person 4. A. challenging      B. challenged   C. to challenge                   D. to be challenged 5. A. availed              B. availing         C. available             D. to avail 6. A. experienced     B. experiencing        C. experience                   D. to experience 7. A. heavy                 B. wide              C. large                       D. great 8. A. lead          B. led                 C. leading                   D. to lead 9. A. in                        B. for                  C. at                            D. on 10. A. for           B. to                   C. with                        D. from国家开放大学
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