Diatomite is an important nonmetallic mineral raw material.
硅藻土是重要的非金属矿物材料。
Even nonmetallic materials are dangerous to touch at these low temperatures.
在这种低温下，甚至接触非金属材料也是危险的。
Nonmetallic body of cutting tool, cutting tool and its mfg. and using method.
切削工具的非金属本体，切削工具及其制造，使用方法。
Nonmetallic body of cutting tool, cutting tool and its mfg. and using method.
切削工具的非金属本体，切削工具及其制造，使用方法。
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