Halon extinguishers used on a class C fire should be directed at the（）. ["base of the equipment","top of the equipment","power source","source of the fire"]
关于禁止反言，下列表述正确的有（） ["禁止反言主要用于约束保险人","禁止反言是单方法律行为","禁止反言是指保险合同一方既然已经放弃其在合同中的某种权利，将来就不得再向他方主张这种权利","禁止反言又称为禁止抗辩","禁止反言主要用于约束被保险人"]
天然气门站的主要设施有哪些？
金融市场的参与者通过买卖金融资产转移或者接受风险，利用组合投资可以分散那些投资于单一金融资产所面临的系统性风险。
Good housekeeping on a vessel prevents fires by（）. ["allowing better access in an emergency","eliminating potential fuel sources","eliminating trip hazards","improving personnel qualificatio"]
“宁波帮”人士都乐意把自己的经验上升为理念，请列举3部由“宁波帮”人士编写的作品。
