休克病人动态监测中心静脉压值为25cmH₂O，表示（）

A.肺梗死

B.静脉血管床过度收缩

C.肺循环阻力增加

D.血容量不足

E.充血性心力衰竭

The most important thing to remember when launching an inflatable liferaft by hand is to（）.

A.open the CO₂ inflation valve

B.open the raft container

C.ensure that the operating cord is secured to the vessel

D.inflate the raft on the vessel，then lower it over the side