皮皮学，免费搜题
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【单选题】
哮喘患者可出现支气管平滑肌收缩,引起气道阻力增加的因素可能是A.
交感神经兴奋
B.
儿茶酚胺释放增加
C.
PGE 2 释放增加
D.
吸气时O 2 含量增加
E.
内皮素释放增加
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】—Look, the paint is starting to come off ____ the wall is damp. —Well, we'd better have the wall repainted some day.
A.
when
B.
where
C.
if
D.
once
【单选题】The door______. We'd better have it repaired.
A.
isn't shut
B.
hasn't been shut
C.
won't be shut
D.
won't shut
【单选题】We'd better have our meals______.
A.
at the same time each day
B.
when our work is over
C.
when the meal is still hot
D.
when every one of the family is home
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