In fresh water lake, trace elements belonging to hard acid exist mainly as free ion.
在淡水湖泊中，属于硬酸的元素主要以游离离子存在。
Free supply of packaging materials, pick up service, and track trace service.
免费提供包装物料、上门提货及专人查询跟踪服务。
Free supply of packaging materials, pick up service, and track trace service.
免费提供包装物料、上门提货及专人查询跟踪服务。
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