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【判断题】
单活塞杆液压缸小腔进油、大腔回油时活塞的运动速度v 2 与大腔进油、小腔回油时活塞的运动速度v 1 的比值称往返速比λv,即活塞杆退回、前进的速度之比v 2 /v 1 。A.
正确
B.
错误
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【单选题】What is Rutan’s biggest achievement according to the video?
A.
He ended the government’s monopoly on space travel.
B.
He founded Virgin Galactic the world’s first spaceliner.
C.
He won a lot of trophies by making model planes.
D.
He successfully attracted investment from the richest man to the space industry.
【简答题】What did Paul Allen ’ s money mean to Rutan ’ s engineers?
【单选题】毛泽东在( )中阐明了党的抗日民族统一战线新政策。
A.
《星星之火，可以燎原》
B.
《反对本本主义》
C.
《论反对日本帝国主义的策略》
D.
《中国革命战争的战略问题》
【简答题】What ’ s Rutan ’ s next vision?
【单选题】What ’ s one engineering breakthrough mentioned about Rutan ’ s spaceship?
A.
It ’ s very light-weight.
B.
It ’ s custom-made from scratch by a very small company.
C.
Feathers are glued to the spaceship to enable safe reentry.
D.
It can reposition itself like a shuttlecock in flight.
【简答题】What ’ s the deal between Branson and Rutan?
【单选题】What's one engineering breakthrough mentioned about Rutan's spaceship?
A.
It's very light-weight.
B.
It's custom-made from scratch by a very small company.
C.
Feathers are glued to the spaceship to enable safe reentry.
D.
It can reposition itself like a shuttlerock in flight.
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