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板式塔流体力学性能测试装置(冷膜塔实验)如本题附图所示。塔内装有三层塔板，塔径D=1m，进出塔的气体管径d=0．3m。塔内最大允许空塔气速u=2．48m／s，该气速下每层塔板的压降785Pa，气体管路的压降为1．4kPa。测试是在常压(101．3kPa)，30℃条件下进行。试选择一台适用的风机。
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举一反三
【判断题】Standard English is taught worldwide and has not changed a lot with time passing.
A.
正确
B.
错误
【单选题】It can be concluded from the passage that______.
A.
Standard English is taught in school and colleges
B.
the young people are defiant because they refuse to speak standard English
C.
English language is influenced by American English in the last 25 years
D.
there has been a great change in the English language in this century
【单选题】It can be concluded from the passage that ______.
A.
Standard English is taught in schools and colleges
B.
The young people are defiant because they refuse to speak standard English
C.
English language is influenced by American English in the last 25 years
D.
There has been a great change in the English language in this century
【单选题】以下关于数据表的设计要求描述错误的是( )
A.
第一行是表的列标题，列标题可重复
B.
第二行是数据部分，数据部分的每一行数据称为一个记录，并且数据部分不允许出现空白行和空白列。
C.
数据表是由标题行和数据部分组成。
D.
数据表中不能有合并单元格存在
【单选题】he realized it was too late to return home.
A.
No sooner it grew dark than
B.
Hardly did it grow dark when
C.
I t was not until dark that
D.
I t was until dark that
【单选题】English is taught _________ a foreign language in almost all school in China.
A.
with
B.
by
C.
as
D.
for
【单选题】以下关于数据表的设计要求描述错误的是()。
A.
数据表是由标题行和数据部分组成
B.
第一行是表的列标题，列标题可重复
C.
第二行是数据部分，数据部分的每一行数据称为一个记录，并且数据部分不允许出现空白行和空白列
D.
数据表中不能有合并单元格存在
【单选题】English is taught in your country ________ Spanish in theirs.
A.
just as
B.
despite
C.
so
D.
like
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