Valve rod seal packing can adopt lip shape structure, seal up dependable, Operates moment of force small.

阀杆密封填料可采用唇形结构，密封可靠、操作力矩小。

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Different lip shape and matrix formula of coring bit apply to various coring work in complex rock. The core can provide reliable data to geological and engineering research.

取芯钻头不同的唇面形状、胎体配方可适应各种复杂岩层的取芯，所钻取的岩芯将为地质和工程研究提供可靠的数据。

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