Early credit CARDS were made of celluloid plastic, then metal and fiber, then paper, and are now mostly plastic.

早期的信用卡由胶质塑料制成，后来是金属和纤维，再后来是纸，现在大多数是塑料制成的。

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This paper proposes the new technology of preparing alkyd resin by mustard oil instead of bean oil with discussions made on its applications in the preparation of amino celluloid baking paints.

研究了以芥油代替豆油制备醇酸树脂的工艺方法，探讨了树脂在制备氨基漆中的应用。

youdao

This paper proposes the new technology of preparing alkyd resin by mustard oil instead of bean oil with discussions made on its applications in the preparation of amino celluloid baking paints.

研究了以芥油代替豆油制备醇酸树脂的工艺方法，探讨了树脂在制备氨基漆中的应用。

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