Which of the following items is necessary for all waste heat boiler installations, regardless of design or manufacturer? （） ["Control of evaporation","A separate means to prevent feed-water contamination","Power circulating pump","Super-heater"]
巷道施工方案有两种，一种是一次成巷，另一种是多次成巷。
Cargo on deck，plants and live animals are usually received，handled，carried，kept and discharged at（）. ["Carrier’s risk","Owner’s risk","Merchant's risk","Charterer’s risk"]
含油污水处理方法之一的过滤法中，对滤料的选材要求为（）。 ["具有足够的机械强度","具有稳定的化学性质，不与水发生化学反应","具有一定的颗粒和适当","以上三种均须满足"]
试述墙身水平防潮层的位置及做法？
通信工程中，对光、电缆埋设标有哪些要求？
