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一、情境导入阅读如下材料,了解融雪剂的成分和对目前我们所处环境的影响。北方冬季雪后,及时有效地清除道路上的积雪对于保证交通的畅通和车辆的安全是十分重要的。一些发达国家,比我国更早地遇到了清除道路冰雪的难题,曾经采用过许多策略和方法,其中最重要的方法之一,就是在雪前、雪后向道路、桥梁等撒融雪剂,又称“化冰剂”。其中氯盐型融雪剂是最常用的。最初是以食盐即氯化钠为主,后来氯化钙、氯化
First, the introduction of the situation Read the following materials to understand the composition of deicing salt and the current environment in which we are affected. After the northern winter snow, timely and effective removal of snow on the road is very important to ensure traffic flow and vehicle safety. Some developed countries have encountered the problem of clearing roads and snow earlier than our own and many strategies and methods have been adopted. One of the most important methods is to scatter snow and snow to roads and bridges before snow Called “Ice agent ”. Among them, chloride salt type deicing salt is the most commonly used. The initial salt is sodium chloride, then calcium chloride, chloride