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【单选题】
非线性缓冲器作用时轿厢反弹的最大速度不应超过（ ）m/s。A.
.63
B.
.8
C.
1
D.
.9
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【简答题】CR 系统主要是由( )、( )、( )和( )组成。
【简答题】Thomas Edison was born in America. He invented plenty of electric appliances(电器) and people from all over the world know him. At that time, there was no electric lamp in the world. And it brought peop...
【简答题】CR系统主要由X线机、（）、（）、影像后处理工作站和存储装置等组成。
【单选题】LOC方式的子方式有（）
A.
LOC预位、LOC截获、LOC在航道上
B.
LOC截获、LOC在航道上
C.
LOC预位、LOC截获
D.
LOC预位、LOC截获、着陆
【单选题】What do you know about Joe?
A.
He is a mechanic.
B.
He can fit up electric lighting.
C.
He works very hard.
D.
All of the above.
【单选题】Edison failed _____ times before he succeeded in producing the first electric lamp .
A.
thousand
B.
thousands
C.
a thousand of
D.
thousands of
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