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【单选题】
对于某台完全燃烧的燃煤锅炉,假设测量烟道某处的O2体积浓度为7%,则该处的过量空气系数大约为( )。A.
0.7
B.
1.4
C.
1
D.
1.5
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举一反三
【单选题】What's the difference between professional training and college education?
A.
the former can only provide students with professional skills while the latter enables students to become civilized humans.
B.
the former enables students to become civilized humans while the latter can only provide students with professional skills.
【单选题】College-age athletes who drop out of college to play professional sports
A.
are not rational decision makers.
B.
are well aware that their opportunity cost of attending college is very high.
C.
are concerned more about present circumstances than their future.
D.
underestimate the value of a college education.
【单选题】How many people attend professional and college sporting events to cheer their teams?
A.
Hundreds
B.
Hundreds B) Thousands
C.
Millions
D.
Hundreds of Millions
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