A Trip to the Forest
   One day Bob took two of his friends into the mountains. They put up their tents and then rode off to a forest to see how the trees were growing.
   In the afternoon when they were about ten kilometres from their camp（营地）, it started to snow. More and more snow fell. Soon Bob could hardly see his hands before his face. He could not find the road. Bob knew there were two roads. One road went to the camp, and the other went to his house. But all was white snow. Everything was the same. How could he take his friends back to the camp?
   Bob had an idea. The horses! Let the horses take them back! But what would happen if the horses took the road to his house? That would be a trip of thirty-five kilometres in such cold weather!
   It was getting late. They rode on and on. At last the horses stopped. Where were they? None of them could tell. John looked around. What was that under the tree? It was one of their tents!

2016年是中国工农红军长征胜利80周年。从大年初一开始，位于福建省上杭县的国家5A级红色旅游景区古田红色旅游累计接待游客15.63万人次，同比增长21.1%。古田镇在20年前已经是亿元城镇。但以水泥等为支柱的工业，带来了严重污染。近年来，古田镇以红色旅游为依托，在加强古田会议会址群保护，传承红色文化的同时，综合提升本地的经济实力；该镇淘汰落后产能企业28家，取缔无证各类企业52家；大力发展生态农业，重点推进古田现代农业示范区项目；成立电商中心，引导“红军街”向“淘宝街”转型，吸引周边店商向这里聚集；新增农村劳动力转移就业1526人。目前，该镇的社会总产值、农民人均纯收入实现年均两位数增长。

结合材料和所学经济知识，分析古田镇的举措对当地经济发展所起的作用。

下列不属于水解过程的是（　　）

下列选项各图中所标的导体棒的长度为L，处于磁感应强度为B的匀强磁场中，棒运动的速度均为v，产生的电动势为BLv的是（   ）