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铸造用湿型砂有效膨润土及有效煤粉 试验方法

Test method for effective bentonite and effective seacoal aontent in green molding sand
标准号:JB/T 9221-1999
Test method for effective bentonite and effective seacoal aontent in green molding sand
标准号:JB/T 9221-1999