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【单选题】
铁路货车斜探头空载始波宽度的测试时,先将直探头置于CSK-IA标准试块上厚度()处,调节探伤仪,定出标记。
A.
81mm
B.
91mm
C.
101mm
D.
121mm
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【单选题】A rock ____ out of the ground tripped him. He fell and hit his forehead on a stone. That is how he got this big ____.
A.
protruding, bulge
B.
sticking, bulge
C.
sticking, swelling
D.
jutting, bulging
【判断题】离合器自由间隙过大,容易产生打滑。
A.
正确
B.
错误
【简答题】完形填空。 A door was locked. A big stone came and hit the door. But he couldn't 1 it. Later a key came. He 2 the lock and the door opened. The stone was very 3 that the key could open it so easily. He ask...
【简答题】bulge; protrude; stick; jut; swell 5. A rock _______ of the ground tripped him. He fell and hit his forehead on a stone. That's how he got this big ______.
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【单选题】Here is such a big stone ______ no man can lift.
A.
that
B.
as
C.
this
D.
it
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【单选题】A rock sticking out of the ground tripped him. He fell and hit his forehead on a stone。 That's how he got this big ______.
A.
bulging
B.
protruding
C.
sticking out
D.
jutting
E.
swelling
【简答题】设(A,+,·)是一个环,并且对于任意的a∈A,都有a·a=a,此环称为布尔环. 证明:(1)对于任意的a∈A,都有a+a=0,其中0是加法单位元素; (2)(A,+,·)是可交换环.
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