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【单选题】
下列缺氧引起呼吸系统变化错误的是
A.
低缺氧,呼吸可加深加快,肺通气量增加
B.
等低氧血症一般不发生呼吸系统的增强
C.
慢性低缺氧,肺通气量增加不明显
D.
低缺氧的动脉氧分压下降越明显,呼吸中枢兴奋越强烈。呼吸运动加强越明显
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SELECT S# FORM SC WHERE C#='C2' AND GRADE＞＝ (SELECT GRADE FORM SC WHE
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SELECT S# FORM SC WHERE C#=“C2” AND GRADE＞＝ (SELECT GRADE FORM SC WHERE GRADE >=60)
B.
SELECT S# FORM SC WHERE C#=“C2” AND GRADE IN (SELECT GRADE FORM SC)
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