单项选择题
A.Pa02为50mmHg，PaC02为40mmHg B.Pa02为55mmHg，PaC02为50mmHg C.Pa02为65mmHg，PaCOz为40mmHg D.Pa02为70mmHg，PaC02为40mmHg E.Pa02为70mmHg，PaC02为45mmHg
A.交替脉 B.水冲脉 C.短绌脉 D.奇脉 E.重搏脉
A.窦房结 B.心房肌 C.房室交界 D.浦肯野纤维 E.心室肌