Three standard grades of magnetic materials are offered to fulfill a broad spectrum of magnetic field requirements along with a high resistance to demagnetization.
同时提供三个标准等级的磁性材料，满足具有高抗退磁磁场的广泛需求。
Standard land should be classified at different levels according to three basic functions-for business, residential and industrial uses-and relevant grades.
标准宗地应按商业、居住和工业三种基本用途与相应的级别分层次设置。
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