排水系统中清通设备有哪些？起什么作用？
开发方式是指依靠（）开发油田。 ["条件","政策","方针","能量"]
SUNSET E10仪表具备以下哪些功能（）。 ["检测NO1信令","检测E1误码","检测NO7信令","监听E1时隙语音信号"]
无水采油阶段的采收率称为（）采收率。 ["无水","最终","理论","实际"]
Delivery to carriers（）the transit of the goods even though they are employed by the buyer，unless the intention of the parties is clearly to the contrary. ["ends","completes","does not end","does not complete"]
简述池塘硫化氢的来源。
