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【简答题】
当渐缩斜切喷嘴的压力比ε n ______临界压力比ε cr 时,蒸汽在斜切部分发生膨胀,此时喷嘴出口汽流速度______于临界速度。
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举一反三
【单选题】The idea of test-tube babies is quite amazing.
A.
Right
B.
Wrong
C.
Not mentioned
【判断题】王清任《医林改错》在中医学史上第一次正确描述了膈肌,并明确肯定了脑主宰思维记忆的功能。()
A.
正确
B.
错误
【单选题】Into the dark apartment _______, who was quite surprised when everyone shouted “Happy Birthday”.
A.
did David walk
B.
David walked
C.
David did walk
D.
walked David
【单选题】下列有关世界地形表述错误的是(  )
A.
世界最大的盆地是刚果盆地
B.
世界最大的平原是亚马孙平原
C.
世界面积最大的高原是青藏高原
D.
世界最长的山脉是安第斯山脉
【单选题】Due to the entry and exit of firms in a monopolistically competitive market:
A.
economic profits and economic losses are dissipated in the long run.
B.
economic profits persist in the long run, but not economic losses.
C.
economic losses will exist in the long run, but not economic profits.
D.
both economic profits and economic losses exist in the long run.
【简答题】我国地势的特点是西高东低,呈______,我国面积最大的平原是______.
【单选题】____ _ he can pass the driving test is quite uncertain.
A.
If
B.
Whether
C.
That
D.
What
【判断题】王清任《医林改错》在中医学史上第一次正确描述了膈肌,并明确肯定了脑主宰思维记忆的功能。
A.
正确
B.
错误
【单选题】Some blood types are quite common, others are regionally , and still others are rare everywhere.
A.
distributed
B.
contributed
C.
obtained
D.
Convinced
【单选题】–Frank failed the driving test again. --______ He practiced a lot and was quite confident.
A.
What if?
B.
How come?
C.
So what?
D.
Why not?
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