Valve flap can all be made of metal can also be embedded in the metal on leather, rubber, or synthetic coverage, depending on the use of performance requirements.

阀瓣可以全部用金属制成，也可以在金属上镶嵌皮革、橡胶、或者采用合成覆盖面，这取决于使用性能的要求。

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Its comprehensive coverage focuses on detection of defects in all types of metal castings.

它的广泛报导集中在所有类型金属铸件的探伤。

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The contact window formed by using said method possesses excellent metal aluminium graded coverage rate, and can make electric connection reliable, and do not increase cost.

由此形成的接触窗具有较佳的金属铝阶梯覆盖率，使得电连接可靠，且不会增大成本。

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