采用高频开关型整流器的局(站)整流器的容量及数量配置要求是:应按()冗余方式确定整流器配置,其中N只主用。
A.N
B.N-1
C.N+1
D.2N
参考答案:A
To our surprise, the missing suitcase ______, completely empty, near our office building the next morning.
A.found out
B.turned up
C.got back
D.come from
亭集中了中国古代建筑最富民族形式的精华,常见的亭有()。
A.三角亭
B.梅花亭
C.套方亭
D.扇面亭