直埋敷设于非冻土地区时,电缆外皮至地下构筑物基础,不得小于( )。
A.0.2m
B.0.5m
C.0.3m
D.1m
参考答案:C
解析:[知识点] 电缆直埋敷设于土中的设计要求
— It isn't a football, is it?
— ________ It is a basketball.[ ]
A. Yes, it is.
B. No, it isn't.
C. Yes, it isn't.
D. No, it is.
中原文化为什么能在海内外产生巨大影响?