BACKGROUND: Venipuncture is one of the most common methods in the clinical treatment.
张萍背景：静脉穿刺是临床治疗最常用的方法之一。
Based on analyzing the past engineering projects, this paper expounds how to make the rational selection of common foundation treatment methods under different geological conditions.
通过对以往工程实例的分析，阐述了常用地基处理方法在不同地质条件下如何合理选用。
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 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。
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