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【简答题】
根据国家标准的规定,安装节流装置应该是直的圆形管道、内壁洁净,其表面粗糙度应符合标准规定;在节流装置前要求有管道直径 D 的( ) 倍的直管段,其后应有( ) D 的直管段;节流件开与管道的轴线应同心,节流件的端面与管道轴线( );板不可反装,尖锐的一侧着流向为( )侧,喇叭形一侧为( )侧;流体应充满管道并连续、稳定地流动等等。
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had
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bought
C.
have had
D.
have bought
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have
B.
had
C.
have had
D.
can have
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A.
had
B.
bought
C.
have had
D.
have bought
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A.
3759 Pa
B.
3.759×10 6 Pa
C.
3.759×10 7 Pa
D.
37590 Pa
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A.
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B.
which to watch
C.
how should I watch
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what should I watch
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A.
Definition and example
B.
Comparison and/or contrast
C.
Cause and effect
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