1.The minimum maintained separation between water pipelines and drainage pipelines shall be:
1. 给水管道与排水管道之间必须保持的最小间距是多少？
2.The design and effectiveness of a safe trench shoring system primarily depends on:
2.安全沟槽支护系统的设计和有效性主要取决于：
3.According to National Sanitation Foundation (NSF) standards, plastic pipe used for transporting potable water must have which designated number?
3.根据美国国家卫生基金会（NSF）标准，用于输送饮用水的塑料管必须标注哪个编号？
4.What is the proper installation location for straw-filled wattles used for erosion and sediment control?
4.用于防止水土流失和沉积物控制的稻草填充拦水条（Straw Wattles）应如何安装？
5.The economical height limitation for an unrestrained shoring system is a maximum of:
5.无约束支护系统（Unrestrained Shoring System）的经济适用最大高度是多少？
6.Reinforced concrete drainage pipes shall contain a minimum amount of cementitious material equal to:
6.钢筋混凝土排水管（RCP）每立方码混凝土中至少应含多少胶凝材料？
7.During microtunneling and pipe jacking operations, what method helps reduce installation friction?
7.在微型隧道施工（Microtunneling）和顶管施工中，哪种方法可以降低安装摩擦力？
8.The commonly used timber lag dimensions for tunnel excavation support systems are:
8.隧道开挖支护系统中常用的木质横撑尺寸为：
9.A California Registered Professional Engineer must prepare the protective system design for excavations exceeding:
9.当开挖深度超过多少时，必须由加州注册专业工程师（Registered Professional Engineer）设计防护系统？
10.The maximum allowable pressure for void-filling grout injection is:
10.填充空洞注浆（Void-Filling Grout Injection）的最大允许压力是多少？
