在慢性肺心病的发生、发展过程中，导致肺血管阻力增加的最主要因

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问题单项选择题

在慢性肺心病的发生、发展过程中，导致肺血管阻力增加的最主要因素是

A．缺氧

B．高碳酸血症

C．呼吸性酸中毒合并代谢性碱中毒

D．电解质紊乱

E．肺部感染

答案

参考答案：A

选择题

— Did you return the book to me? Why can’t I find it anywhere?

— ________. You were writing a letter at your desk at that time.

A．I will give it to you

B．I did give it to you

C．I had given it to you

D．I do give it to you

判断题

承诺“包过”的公务员辅导班能有效提高大学生通过考试的成功率。