The present state of non asbestic friction material production in China and requirement in early years of 21st century are presented.
析了我国非石棉摩擦材料生产的现状及21世纪初的需求量;
The present state of non asbestic friction material production in China and requirement in early years of 21st century are presented.
析了我国非石棉摩擦材料生产的现状及21世纪初的需求量;
明：以上例
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