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【单选题】
某温度时，N 2 +3H 2 2NH 3 的平衡常数K=a，则此温度下，NH 3 3/2H 2 +1/2N 2 的平衡常数为 [ ]A.
B.
C.
D.
a 2
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【单选题】'I missed the train home last night.''So ______'
A.
have I
B.
I have
C.
did I
D.
I did
【单选题】Yesterday, I arrived at the bus stop so late that I ______ missed the last bus.
A.
only
B.
fairly
C.
solely
D.
narrowly
【单选题】I must go now; I can’t risk the last bus. A) missed B) to be missed C) missing D) to miss
A.
missed
B.
to be missed
C.
missing
D.
to miss
【简答题】I missed the last bus last night, so I could not but __________ all the way home. [A] walking [B] to walk [C] have walked [D] walk
【单选题】----What a pity! I missed the last concert of the year. ----Oh, not at all. It was so terrible. In fact, I would rather I there.
A.
hadn’t been
B.
was not
C.
haven’t been
D.
am not
【单选题】I missed the last bus. I could do nothing but______in the village for the night.
A.
to stay
B.
stay
C.
staying
D.
stayed
【简答题】商贸企业的仓库可存放哪些物资?
【单选题】I missed the last bus, so I _____ go home on foot.
A.
must
B.
have to
C.
may
D.
had to
【单选题】I missed the last bus and had no money for a taxi; so I could do nothing but_______ home last night.
A.
to walking
B.
walk
C.
walking
D.
walked
【简答题】简述确知信号、随相信号和起伏信号的特点
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