Ⅱ型呼吸衰竭是指PaO2______，PaCO2______，其氧疗原则是______。
参考答案：小于60‖大于50‖低浓度持续吸氧
Which of the following most accurately describes the passage
A．(A) A description of a replicable experiment
B．(B) A summary report of new findings
C．(C) A recommendation for pursuing a new area of research
D．(D) A refutation of an earlier hypothesis
E．(E) A confirmation of an earlier research
《部标》对客运乘务人员仪容仪表的着装标准是怎样规定的？
