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【单选题】
交感神经兴奋引起的心率加快由下列哪种受体介导?( )A.
α1肾上腺素能受体
B.
α2肾上腺素能受体
C.
β1肾上腺素能受体
D.
β2肾上腺素能受体
E.
M胆碱能受体
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皮皮学刷刷变学霸
举一反三
【单选题】Spelling Bee is a contest competitors, usually children, are asked to spell as many words as possible.
A.
which
B.
where
C.
what
D.
When
【简答题】He made many spelling mistake because of__________.
【单选题】Spelling Bee is a contest ________ competitors, usually children, are asked to spell as many words as possible.
A.
which
B.
where
C.
what
D.
when
【单选题】He made many spelling mistake because of__________.
A.
careless
B.
careful
C.
carelessness
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