用波长为313nm的单色光照射气态丙酮,发生下列分解反应:
(CH3)2CO(g)+hν→C2H6(g)+CO(g)
若反应池的容量是0.059dm3,丙酮吸收入射光的分数为0.915,在反应过程中,得到下列数据:
反应温度840K 照射时间t=7.0h
起始压力102.16kPa 入射能48.1×10-4J·s-1
终了压力104.42kPa
计算此反应的量子效率。
第2题
A、lent
B、had lent
C、would lend
D、would have lent
第3题
I hoped that the book was as ______ as the one you lent me.
A.good
B.well
C.better
D.best
第4题
A、would have lent
B、would lend
C、lent
D、had lent
第5题
I hoped that the book was as ______ as the one you lent me.
A.good
B.well
C.better
D.best
第6题
I forgot to return the book to you yesterday. So I _____________today.
A.might do it
B.must do it
C.had to do it
D.must have to do it
第7题
A、would have lent
B、would lend
C、would have lend
D、could lend
第8题
听力原文:Have you finished the book Judy lent you?
(A) Yes, I have 5 more pages.
(B) Yes, I finished preparing the meeting.
(C) Yes, I gave it back to her.
(30)
A.
B.
C.
第9题
听力原文:W: I'm afraid I need that book that I lent you last week for an assignment.
M: Right, I'll just see if I have it with me. If not, I'll give it to you later today.
Q: When will the woman get her Book hack?
(13)
A.She already has it.
B.In an hour.
C.Today.
D.Never.
第10题
A.A.would lend
B.B.would have lent
C.C.lent
D.D.should have lended
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