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【单选题】
（单选）流化床的流化数是指（）
A.
流体通过床层时的流速与临界流化速度之比
B.
空床速度与临界流化速度之比
C.
带出速度与临界流化速度之比
D.
带出速度与空床速度之比
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【单选题】What is the main aim of book review? （单选）
A.
analyzing a perspective or argues a point
B.
analyzing or discussing researches previously published by others
C.
summaries and comments on a newly published academic book
D.
summaries, reviews and comments the research trends, the major discoveries, significant findings, the leading opinions on a particular subject.
相关题目：
【单选题】What is the main aim of book review? （单选）
A.
analyzing a perspective or argues a point
B.
analyzing or discussing researches previously published by others
C.
summaries and comments on a newly published academic book
D.
summaries, reviews and comments the research trends, the major discoveries, significant findings, the leading opinions on a particular subject.
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