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【单选题】
某液体在内径为d1的水平管路中稳定流动,其平均流速为u0,当它以相同的体积流量通过等长的内径为d2(d2/d1=1/2)的管子时,若流体为层流,则压降△p为原来的 倍。
A.
4
B.
8
C.
16
D.
32
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参考答案：
举一反三
【单选题】旋光度测定所用光源常用
A.
氢灯
B.
汞灯
C.
钠光D线
D.
254nm
E.
365nm
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【单选题】The passage tells us that the majority of the British people______.
A.
like the government in office to be criticized by the parties which are in opposition
B.
are keen on debate and discussion
C.
favor the sort of democratic process in Parliament
D.
appreciate strong disagreements existing in Parliament
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【判断题】抽样检验值指从批量为 N 的一批产品中随机抽取其中的一部分单位产品组成样本
A.
正确
B.
错误
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【判断题】The Merriam-Webster Learner's Dictionary defines "Public Health" as: "1. The health of people in general. 2. US : the science of caring for the people of a community by giving them basic health care a...
A.
正确
B.
错误
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【单选题】具有较高( )电压的焊接电源不仅引弧容易,而且电弧燃烧稳定。
A.
焊接
B.
网络
C.
空载
D.
工业
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【判断题】具有较高空载电压的焊接电源不仅引弧容易，而且电弧燃烧也稳定。( )
A.
正确
B.
错误
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【单选题】听力原文：You have heard the legend about the reputation of the people of Zambia: genuinely warm, extraordinarily friendly and interested in welcoming us to their country. We have had a hand in turning it ...
A.
A professor on tourist economy
B.
An official from Africa
C.
A sales person
D.
A Zambian tourist guide
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【单选题】What was the source of the following phrase: "Government of the people, by the people, for the people"?
A.
The speech " I Have a Dream"
B.
Declaration of Independence
C.
US Constitution
D.
Gettyburg Address
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【单选题】Who are the closest people to us according to the writer of this passage?
A.
The people who love us.
B.
The people who understand us.
C.
Our father and mother.
D.
All the family members.
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【简答题】A sign can be found in the front yard of a house in the US. The people living here want to let their dog play outside and ensure it won’t run into the street. So, they hire a company to set up an “inv...
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相关题目：
【单选题】旋光度测定所用光源常用
A.
氢灯
B.
汞灯
C.
钠光D线
D.
254nm
E.
365nm
查看完整题目与答案
【单选题】The passage tells us that the majority of the British people______.
A.
like the government in office to be criticized by the parties which are in opposition
B.
are keen on debate and discussion
C.
favor the sort of democratic process in Parliament
D.
appreciate strong disagreements existing in Parliament
查看完整题目与答案
【判断题】抽样检验值指从批量为 N 的一批产品中随机抽取其中的一部分单位产品组成样本
A.
正确
B.
错误
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【判断题】The Merriam-Webster Learner's Dictionary defines "Public Health" as: "1. The health of people in general. 2. US : the science of caring for the people of a community by giving them basic health care a...
A.
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B.
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【单选题】具有较高( )电压的焊接电源不仅引弧容易,而且电弧燃烧稳定。
A.
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B.
网络
C.
空载
D.
工业
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【判断题】具有较高空载电压的焊接电源不仅引弧容易，而且电弧燃烧也稳定。( )
A.
正确
B.
错误
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【单选题】听力原文：You have heard the legend about the reputation of the people of Zambia: genuinely warm, extraordinarily friendly and interested in welcoming us to their country. We have had a hand in turning it ...
A.
A professor on tourist economy
B.
An official from Africa
C.
A sales person
D.
A Zambian tourist guide
查看完整题目与答案
【单选题】What was the source of the following phrase: "Government of the people, by the people, for the people"?
A.
The speech " I Have a Dream"
B.
Declaration of Independence
C.
US Constitution
D.
Gettyburg Address
查看完整题目与答案
【单选题】Who are the closest people to us according to the writer of this passage?
A.
The people who love us.
B.
The people who understand us.
C.
Our father and mother.
D.
All the family members.
查看完整题目与答案
【简答题】A sign can be found in the front yard of a house in the US. The people living here want to let their dog play outside and ensure it won’t run into the street. So, they hire a company to set up an “inv...
查看完整题目与答案
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