铁路交叉路口的安全闸正在放下来。
笔者首次把弹簧制动、液压松闸闭式多盘湿式制动器应用到国产车辆上，使制动系统更加简单、安全、可靠。
It is the first time for the hydraulic loose-brake and multi-dish wet brake with spring braking to be used in vehicle made in China, making the braking system more simple, safer and reliable.
本文主要论述了一种煤矿绞车盘形闸安全工作监测报警系统的设计与实现。
The essay mainly discusses a kind of design and reality of the system monitoring safety working of the dish-brake of the coal winch.
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