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【单选题】
国际标准对VDR的要求为________。A.
备用电源最长消耗时间约l2 h
B.
应急电源最长消耗时间的l2 h
C.
备用电源最长消耗时间约2 h
D.
应急电源最长消耗时间约2 h
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【单选题】They are turned around in a huge machine to get them __________ the forces they will experience in space flight.
A.
use
B.
used
C.
used to
D.
be used to
【简答题】The machine was huge; it weighed 30 tons and contained over 18,000( ) 真空管 .
【简答题】常见的平面体有棱柱、棱锥、棱台等。常见的回转体有（）；（）、圆台、等。
【判断题】The significance of the appearance of the first Apple computer is that it changed the public’s idea of a computer from a home appliance to a huge machine for scientific use that could be used by anyon...
A.
正确
B.
错误
【简答题】Answer the questions. If you travel to England, don’t miss the Stonehenge in Wiltshire, 120 km in the south-west of England. Stonehenge is made up of a circle of huge stones. It was built more than 4,...
【单选题】We use the machine to _______ the huge stone off the ground.
A.
hoist
B.
applause
C.
rap
D.
propel
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