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【单选题】
螺纹联接防松的根本问题在于
A.
增加螺纹联接的轴向力
B.
增加螺纹联接的横向
C.
防止螺纹副的相对转动
D.
增加螺纹联接的刚度
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举一反三
【单选题】The elephant I saw in the zoo ate_____all the things the visitors gave it.
A.
up
B.
at
C.
out
D.
off
【单选题】As in the case of a voyage charter-party,it is implied in all bills of lading that ______ will be made from the contractual route unless such deviation is justified.
A.
deviation
B.
no deviation
C.
navigation
D.
no navigation
【多选题】层流与湍流的主要区别是( )。
A.
湍流流速大于层流;
B.
层流雷诺数小于湍流雷诺数;
C.
湍流时流通截面积大,层流时流通截面积小;
D.
层流时流体质点无宏观混合,湍流时流体质点发生高频脉动
【单选题】Maria:Morley, where are the cookies. Don't tell me you ate them all! Morley: Yes, I did. _________ .
A.
I couldn't bear it.
B.
They were too good to eat
C.
I couldn't help it.
D.
They were good to eat
【单选题】层流与湍流的主要区别是( )
A.
湍流流速大于层流
B.
层流雷诺数小于湍流雷诺数
C.
湍流时流通截面积大,层流时流动截面积小
D.
层流时流体质点无宏观混合,湍流时流体质点发生高频脉动
【多选题】层流与湍流的主要区别是()
A.
湍流流速大于层流
B.
层流雷诺数小于湍流雷诺数
C.
湍流时流通截面积大,层流时流通截面小
D.
层流时流体质点无宏观混合,湍流时流体质点发生高频脉动
【单选题】石灰稳定土层施工日最低气温应在( )°以上。
A.
7
B.
6
C.
5
D.
4
【单选题】Christmas is ________ federal holiday in the States—all government employees get ________ day off.
A.
the; the
B.
a; /
C.
a; the
D.
/; the
【单选题】--- John, where are the cookies? Don’t tell me you ate them all! --- ______ I couldn’t help it. They were so good.
A.
Yes, I did.
B.
No, I didn’t.
C.
Yes, I have.
D.
Why? Sounds strange!
【简答题】为使孔板前后沿圆周方向压力均匀,取得较正确的差压,因此在孔板设计中,多采用()。
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