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