The coal classification distribution of coal bearing strata in the Up Permian Series of Guizhou has an X type feature in plan.
贵州上二叠统含煤岩系煤级分布在平面上呈现X型分布特征，即具有东、西侧变质低，中部变质高的特点，分布规律明显。
An automatic control system of a punching machine with X-type airflow-distribution board is designed for electrostatic precipitator production.
为了实现电除尘器用X型气流分布板冲孔设备的自动化，设计了一套自动控制系统。
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