塑料瓦（plastic roofing sheet） 本产品以聚氯乙烯树脂粉为原料（简称PVC）,辅其它化工原料，经科学配比，取用先进工艺制成。
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... plastic theory of limit design 塑性极限设计理论 plastic tile 塑料瓦 plastic waste 塑料废料 ...
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plastic bush » 塑料瓦 of any required re-performance of value added machining or other service), incurred by Buyer shall be for Seller's accou...
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对塑料瓦的设计原则和优化设计问题进行了分析。
The design principle and the optimum design problem for the plastic bush have been analyzed.
塑料瓦结构简单、拆换方便，便于运行维护和检修。
For plastic pads exist the advantage of simple construction, and easy dismount, they are convenient to maintain and overhaul.
推力盘为钢制材料制成，推力轴承瓦面为塑料瓦材料制成。
Thrust disc is made of steel and thrust bearing bushing surface is made of plastic bushing.
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