皮皮学，免费搜题
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【单选题】
维持胸膜腔负压的必要条件是 答案( )A.
胸膜腔的密闭性
B.
两层胸膜之间有浆液
C.
呼吸肌收缩
D.
胸膜腔内压低于大气压
E.
肺内有表面活性物质
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Tom often talks with his parents in Chinese when they ____ home.
A.
is
B.
are
C.
were
【简答题】C33DB 驱动电机控制器采用三相两电平电压源型逆变器,是驱动电机系统的控制中心,又称( )
【单选题】Sometimes I can’t help wondering what’s the matter with Tom．I can’t stand it that he often_____ me and talks with the other students around him．
A.
upsets
B.
recognizes
C.
concerns
D.
Ignores
【单选题】Sometimes I can’t help wondering what’s the matter with Tom．I can’t stand it that he often_____ me and talks with the other students around him．
A.
upsets
B.
recognizes
C.
concerns
D.
ignores
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