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我县位于黑龙江省齐齐哈尔西北部,在高中地理第十一章“环境和环境问题”一节中提到“克山病”是由于水土中缺少硒所造成的。因为这种疾病在很久以前发生过,现在这种病已不复存在了。但对今天的中学生来说是非常陌生的,这件事激起了同学们的兴趣,他们都想知道这种病是由什么原因引起的?症状如何?最后又是如何根治的?针对这种情
The county is located in the northwest of Qiqihar in Heilongjiang Province. It is mentioned in the eleventh chapter of “Environmental and Environmental Problems” in high school geography that “Keshan disease” is caused by the lack of selenium in soil and water. Because the disease took place long ago, the disease no longer exists. But for today’s high school students is very strange, it aroused the students interest, they all want to know what is the cause of the disease? What are the symptoms? And finally how to cure? Against this situation