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【单选题】
具有下列结构的药物是A.
麻黄碱
B.
胺醇
C.
肾上腺素
D.
去甲肾上腺素
E.
甲氧明
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反馈参考答案：
举一反三
【单选题】When moist air moves over a cooler surface, then may occur.
A.
frontal fog
B.
steam fog
C.
advection fog
D.
radiation fog
【单选题】【单选】When moist moves over a cooler surface, then _____ may occur.
A.
advection fog
B.
radiation fog
C.
frontal fog
D.
steam fog
【单选题】People begin to know that most environmental problems exist because necessary measures for preventing them _____ taken in the past. [ ]
A.
are not
B.
were not
C.
hadn't been
D.
wouldn't be
【单选题】When moisture air moves over a cooler surface, then may occur.
A.
advection fog
B.
radiation fog
C.
frontal fog
D.
steam fog
【单选题】Most(75)measures involve data encryption and password.
A.
security
B.
hardware
C.
display
D.
program
【单选题】Most environmental problems exist because adequate measures for preventing them ______ taken in the past.
A.
was not
B.
were not being
C.
were not
D.
was no to be
【单选题】Most ______ measures involve data encryption and password.
A.
security
B.
hardware
C.
display
D.
program
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