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【单选题】
某项目工程的某个施工乐观工作持续时间为9天,最悲观工作持续时间为19天,最可能持续时间为11天,则该施工段作业所需时间为A.
9
B.
19
C.
11
D.
12
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【简答题】对于反应 3╱2 H2(g) +1╱2 N2 = NH3(g) , 当其中N2因反应消耗了0.3 mol时, 反应进度ξ(mol)为:A. 0.6 B. 0.45 C. 0.3 D. 0.2
【简答题】阅读理解。 Mr Hunt had a bookshop near a hospital. But he never went to see a doctor when he was ill. He usually just took some medicine. One day, when Mr Hunt carried a box of books in his hands, the box ...
【单选题】对于反应3H2(g)+N2(g)=2NH3(g),当其中H2(g)因反应消耗了0.3 mol时,其反应进度ξ等于( )
A.
-0.3 mol
B.
0.1 mol
C.
-0.1 mol
D.
0.3 mol
【简答题】阅读理解 Jerry went to a barber's shop and had his hair cut, but when he came out, he was not happy with the result. When his friend Jack saw him, he said in surprise, 'What has happened to your hair, Jer...
【单选题】对于反应 3/2 H 2 (g) +1/2 N 2 = NH 3 (g) , 当其中 N 2 因反应消耗了 0.3 mol 时 , 反应进度 ξ(mol) 为
A.
0.3
B.
0.45
C.
0.6
D.
0.2
【简答题】A．Catherine went to seek advice for a job. B．Mrs Hunt found a job for her daughter. C．The Careers Officer gave Catherine and her mother some advice. D．Mrs Hunt tried to convince the Careers Advisory O...
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【简答题】对于反应 3╱2 H2(g) +1╱2 N2 = NH3(g) , 当其中N2因反应消耗了0.3 mol时, 反应进度ξ(mol)为:A. 0.6 B. 0.45 C. 0.3 D. 0.2