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介绍了基体采用45钢，表面喷涂工程陶瓷的旋塞阀芯的研制情况。

The development of the ceramic coat plug valve core which substrate USES 45 steel is introduced.

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介绍了一种适用于多变坡度巷道内使用的钢绳芯带式输送机的技术特征、有关计算及应用效果。

The paper introduces the technical features, calculation and operating result of a steel cord belt conveyor, which is suitable to the tunnel with varied slope.

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