我国是一个自然灾害频繁而又严重的国家,每年都有一些地区遭受干旱、洪涝、滑坡、泥石流、台风、冰雹、霜冻、病虫鼠草等灾害的袭击。地震灾害也时有发生,给人民生命财产造成严重损失。一般年份,全国受灾农作物面积(播种面积)400万～4700万公顷,倒塌房屋300万间左右。再加上其? Our country is a country where natural disasters are frequent and serious. Every year, some areas are hit by calamities such as droughts, floods, landslides, mudslides, typhoons, hail, frosts, pests and diseases. Earthquake disasters have also occurred from time to time, causing serious losses to people’s lives and property. In general years, the area affected by the disaster in the country (sown area) is 4 million to 47 million hectares and about 3 million houses are collapsed. Plus it?