下壁心梗心电图改变出现在()
A.V1、V2
B.V7、V8、V9
C.V3、V4
D.Ⅰ、aⅥ
E.Ⅱ、Ⅲ、aVF
参考答案:E
to the conference, we have already discussed this problem among ourselves.[ ]
A. Similar
B. Previous
C. Cautious
D. Senior
一级负荷( )由两个电源供电,当一个电源发生故障时,另一个电源不应同时受到损坏。
A.应
B.宜
C.严禁
D.不应