下列哪项不是呼吸衰竭导致肺性脑病的机制

A．PaO₂下降引起脑血管扩张

B．PaCO₂升高引起脑血管扩张

C．缺氧、酸中毒使脑血管通透性增高，脑水肿

D．合并休克

E．脑细胞内广氨基丁酸生成增多

The nurse is caring for a client who complains of lower back pain. Which instructions should the nurse give to this client to prevent back injury

A．Bend over the object you're lifting.

B．Narrow the stance when lifting.

C．Push or puI1 an object using your arms.

D．Stand close to the object you're lifting.