powder metallurgy oil-impregnated bearing的意思|示意
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粉末冶金含油轴承
powder metallurgy oil-impregnated bearing的网络常见释义
粉末冶金含油轴承 粉末冶金含油轴承 powder metallurgy oil-impregnated bearing; 粉末冶金合金 sintered alloy; .