1.The first step in project planning is:
1.项目规划的首要阶段是：
2.Compliance inspection system aims to:
2.合规检查机制的目的：
3.Water supply pipe velocity range is:
3.给水管道设计流速范围是：
4.Minimum drainage pipe diameter is:
4.排水管最小管径为：
5.Minimum sewage pipe slope is:
5.污水管最小坡度为：
6.Stormwater minimum slope is:
6.雨水管最小坡度为：
7.通气管最小尺寸为：
7.Minimum vent pipe size is:
8.Vent pipe must extend at least:
8.通气管至少伸出屋顶：
9.Vent pipe diameter must be at least:
9.通气管径不得小于排水管的：
10.Vent systems are required to:
10.通气系统用于：
