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【多选题】
装置引入高压氮气时,其管线上的各级( ) 应正常投用。A.
排气阀
B.
导淋阀
C.
减压阀
D.
压力表
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举一反三
【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】卫生纸(成卷,宽度为18厘米) 的商品编码为( )
【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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