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【单选题】地线接地方式、地阻值应符合《传输接地规范》或满足设计文件要求，联合接地电阻：综合通信楼＜（）欧姆；普通机房＜（）欧姆（恶劣环境地区＜（）欧姆
A.
10、1、5
B.
1、10、5
C.
5、1、10
D.
1、5、10
【单选题】The three main types of secondary education in the United States have been provided by the Latin grammar school, the academy, and the public high school. The first of these was a colonial institution....
A.
European educational systems are not good
B.
as high schools developed in the United States, the decision was made to make them responsible to people from all classes of society
C.
there was an aristocratic and selective principle in the European educational tradition
D.
public high schools in the United States embraced the European educational tradition