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。
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。
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。
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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