单选题:inbadwinters,about70percentofthebutterfliescanstayalive

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  • 题目类型:单选题
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题目内容:
inbadwinters,about70percentofthebutterfliescanstayalive A.Right
B.Wrong
C.Notmentioned
参考答案:
答案解析:

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维持胸内负压的必要条件是()A.吸气肌收缩 B.胸膜腔密闭 C.呼气肌收缩 D.肺内压低于大气压

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去甲肾上腺素可以使()

去甲肾上腺素可以使()A.窦房结自律性增高 B.房室传导加速 C.心肌收缩力加强 D.以上都对

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