According to mechanical principle of polypropylene fiber concrete structure, the applicability of polypropylene fiber concrete in the coal mine spray tunnel protection is researched.
根据聚丙烯纤维混凝土结构力学原理，研究聚丙烯纤维混凝土喷层在煤矿锚喷巷道支护中适用性。
According to its working principle, precision metering device can be divided into the pneumatic and the mechanical.
精密排种器以其工作原理可分为机械式和气力式。
Article has first introduced mechanical category in leather and their production work preface, then according to control principle of it to design the PLC electricity control.
文章首先对皮革机械的种类和它的生产工序作了简单的介绍，然后根据它的控制原理来进行P LC电气控制设计。
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