变压器短路试验可以测（）。
A.铁耗
B.铜耗
C.既能测铁耗又能测铜耗
参考答案：B
It is said that older people who are ______ eaters of fish during their youth lose fewer brain cells.
A．special
B．regular
C．common
D．proper
交界性早搏心电图表现有：（）
①P′－R间期＞0.12s
②R－P′间期>0.20s
③代偿间期不完全
④未见异位P′波
A. ①②③
B. ①③
C. ②④
D. ④
E. ①②③④
