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【单选题】
地下水以 10m/d 的流速在粒径为 20mm 的卵石层中运动,当地下水温为 15 °C时,运动粘滞系数为 0.1m 2 /d ,雷诺数为 0 .4,则卵石间的孔隙直径为A.
4 mm
B.
0.25mm
C.
0.4 mm
D.
2.5 mm
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举一反三
【单选题】（14）从认识的顺序上来讲，一项完整的统计工作可分为四个阶段，即（ ）。
A.
统计调查、统计整理、统计设计和统计分析
B.
统计设计、统计调查、统计整理和统计分析
C.
统计调查、统计设计、统计整理和统计分析
D.
统计设计、统计整理、统计调查和统计分析
【单选题】Questions 6 to 10 are based on the following passage There are many older people in the world and there will be many more. A little-known fact is that over 60 percent of the older people live in devel...
A.
is bigger in developed countries than in developing countries
B.
is one-seventh of the population in developing countries
C.
will increase much faster in China than in France
D.
will be sixty percent in developing countries by 2020
【简答题】VLAN是什么? VLAN的优点有哪些?
【单选题】听力原文：M: How many people will be coming to the party on Saturday? W: We had to cross off fifteen names from our original list of one hundred and fifty. Q: How many people do they, expect to attend the ...
A.
15.
B.
50
C.
135.
D.
150
【单选题】听力原文：W: Only eight people took part in my party. M: Really? How many people had you expected to come? Q: What does the woman mean? (12)
A.
They expected more people to the party.
B.
There were too many people at the party.
C.
She didn't expect so many people at the party.
D.
She herself didn't take part in the party.
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