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【单选题】
一台离心泵在管路系统中工作,当阀门,相应的管路性能曲线可写为 H =A + B· q V 2 ,且 B≈0 (即动能增加值,阻力损失两项之和与位能增加值、静压能增加值两项之和相较甚小),当泵的转速增大 10% ,如阀门仍,则实际操作中()。A.
扬程大致不变，流量增大 10% 以上
B.
扬程增大 21% ，流量增大 10%
C.
扬程减小，流量增大 21%
D.
流量不变，扬程增大 21%
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【单选题】I wish that you ______ such a bad headache, then you would have enjoyed the concert. [ ]
A.
hadn't had
B.
didn't have
C.
shouldn't have
D.
won't have
【单选题】Some people believe that if you ______ a mirror, you ______ have seven years of bad luck.
A.
break will
B.
will break would
C.
break would
D.
broke will
【简答题】___________ for the job you have applied for will leave a bad impression on the interviews. A．Not prepared B．Not having prepared C．Not prepare D．Not being prepared
【单选题】If you _____ what he said, you could have avoided repeating such a bad mistake.
A.
paid attention to
B.
had paid attention to
C.
noticed
D.
had noticed to
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