safety gear短语¹⁴⁴⁹⁷²⁺² 基本例句 安全装置 It focuses on the role of safety gear of elevator, intro- duces safety gear types and working principle of safety gear, as well as the general test methods, common safety/span> gear failure, treatment. 着重介绍了安全钳在电梯中所起的作用，安全钳的结构、种类及安全钳的工作原理以及安全钳的一般检验方法，安全钳常见的故障、处理方法。 dictall