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【单选题】
去甲肾上腺素水溶液室温放置或加热时,效价降低,是因为发生了以下哪种反应( )A.
水解反应
B.
还原反应
C.
氧化反应
D.
开环反应
E.
消旋化反应
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举一反三
【单选题】There being no cause for alarm, you ______ in such a panic yesterday.
A.
need not act
B.
did not need to act
C.
need not have acted
D.
did not need to have acted
【单选题】________ no cause for alarm, the old man went back to his bedroom.
A.
There was
B.
Since
C.
Being
D.
There being
【单选题】_______ no cause for alarm, the old man went back to his room.
A.
There was
B.
Since
C.
Being
D.
There being
【单选题】There no cause for alarm, she went back to her room.
A.
being
B.
was
C.
be
D.
has been
【单选题】______no cause for alarm, the old man went back to his bedroom.
A.
There was
B.
Due to
C.
As to
D.
There being
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