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【单选题】
套管由 φ57×2.5mm 和 φ25×2.5mm 的钢管组成,则环隙的流通截面积等于( ),润湿周边长等于( ),当量直径等于( )。
A.
1.632m 2 ; 0.241m ; 27mm
B.
1.632m 2 ; 0.241m ;6.75 mm
C.
1.632m 2 ; 0.121m ; 54mm
D.
0.816m 2 ; 0.121m ;27 mm
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【简答题】Soccer is widely considered to be the most popular sport in the world. More people watch and play soccer than any other sport. Soccer is called "football" in England, where it comes from, and in many ...
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A.
正确
B.
错误
【单选题】螺纹标记Tr52×16(P2)-7H中,螺距、导程、线数分别是( )
A.
16,2,8
B.
2,16,8
C.
8,2,16
D.
8,16,2
【单选题】螺纹标记Tr52×16(P2)-7H中,螺距、导程、线数分别是:( )
A.
16,2,8
B.
2,16,8
C.
8,16,2
D.
8,2,16
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A.
311
B.
264
C.
220
D.
400
【简答题】What is a market segment?
【单选题】Which of the following sentences is not related to the topic of the paragraph?"Daredevil sports are also becoming popular. Young people especially are increasingly willing to risk life and limb while ...
A.
Young people especially are increasingly willing to risk life and limb while mountain biking, backgcountry snowboarding, or high-speed skateboarding.
B.
Soccer is also popular in the United States now, although football is still more popular.
C.
One of the riskiest new sports is skysurfing, in which people jump out of airplanes with boards attached to their feet.
D.
Skysurfing rivals skydiving and bungee jumping for the amount of thrills and risk.
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A.
位移,旋转,缩放
B.
位移,缩放,旋转
C.
旋转,缩放,位移
D.
缩放,位移,旋转
【简答题】Soccer is widely considered to be the most popular sport in the world. More people watch and play soccer than any other sport. Soccer is called "football" in England, where it comes from, and in many ...
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