根据现行的《室外排水设计规范》,雨水管段按()设计。
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对于暗管式雨水管段,其最小设计流速为()m/s。
A. 0.7
B. 0.55
C. 0.75
D. 1.2
雨水管段最小管径按()mm设计。
A. 150
B. 200
C. 300
D. 350
雨水管段的衔接一般采用()方式
A. 管顶平接
B. 管底平接
C. 水面平接
While we listen to a conversation, a question and an answer form a unit which is called one ___1___. It usually centers around one ___2___. Generally speaking, questions are evenly ___3___ among topics, which means answers will show up when topics ___4___.