增加内部七号信令是使用的正确命令是()。
A.ADD N1LNK
A.ADD N7LNK
C.ADD DTFB
D.ADD ITKC
参考答案:B
左室功能不全可出现()。
A.重脉
B.奇脉
C.交替脉
D.水冲脉
E.缺脉
Carbon dioxide as a fire fighting agent has which advantage over other agents?().
A.It causes minimal damage
B.It is safer for personnel
C.It is cheaper
D.It is most effective on a per unit basis