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【简答题】
萃取精馏塔如果不设回收段,把萃剂与塔顶回流同时塔顶打入塔内,将会产生什么后果,为什么? 在萃取精馏中不设回收段,将会使入塔顶的萃取剂得不到回收,塔顶产品夹带萃取剂,从而影响产品的纯度,使塔顶得不到纯净的产品。
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反馈参考答案：
举一反三
【单选题】existing very commonly or happening frequently
A.
assign
B.
submarine
C.
prevalent
D.
explicitly
【单选题】患者,男性,28岁,因外出春游出现咳嗽、咳白黏痰伴喘息1天入院,体检:体温36. 5 C往有哮喘史。该病人哮喘发作最可能的诱因是
A.
花粉
B.
尘螨
C.
动物的毛屑
D.
病毒感染
E.
精神因素
【简答题】A．traditional. B．more melodic. C．very repetitive. D．commonly played.
【单选题】What are very commonly used teaching procedures and stages?
A.
Presentation, practice and production
B.
Pre-reading, while-reading and post-reading
C.
Mechanical practice and meaningful practice
D.
Both A and B
【单选题】患者男性,28岁,因外出春游出现咳嗽.咳白粘痰伴喘息1天入院,体检:体湿36.5°C,脉搏90次/分,呼吸28次/分,血压120/80mmHg,在肺部可闻及广泛哮鸣音,既往有哮喘史。该病人哮喘发作最可能的诱因是
A.
花粉
B.
尘螨
C.
动物的毛屑
D.
病毒感染
【单选题】A unit price contract is very commonly used for ( )
A.
a tunnel
B.
school buildings
C.
an apartment building
D.
a hospital
【简答题】Very __________ is a specialist capable of being an administrator. [A] commonly [B] scarcely [C] rarely [D] hardly
【单选题】What are very commonly used teaching stages?
A.
PPP
B.
PWP
C.
Mechanical practice and meaningful practice
D.
Both A and B
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