某旅行社与游客签订了“新马泰港澳游”合同，出团前因旅行社未办妥旅游签证而无法正常出行。游客提出退团要求，当时正值泰国政局动荡期间，红衫军与政府冲突不断，旅行社以遭遇不可抗拒的情况为由，拖延退款。游客遂想当地旅游质监所进行投诉，要求全额返还所交团款。旅行社的辩解是否合理？
开展维修工作前后必须采取哪些措施？
简述潮流分布的概念。
竞业限制的范围是如何规定的？
If you must land on a beach with an oar-propelled lifeboat through a heavy surf，the recommended method is to（）. keep the bow directly in toward the beach，and tow the sea anchor off the stern。 ride in on the back of a large breaker。 keep the bow into the seas with the sea anchor out over the bow，and row to meet the breaking waves。 head directly into the beach by staying between the crests of the wave。
在市场经济条件下，经济人最基本的天性就是（）
