This article describes its principle and field test methods.
本文介绍了它的原理和野外试验方法。
The paper introduces the present research carboxymethyl starch synthesis principle and method, and the substitution degree of carboxymethyl starch test methods were introduced in detail.
本文介绍了羧甲基淀粉的研究现状，合成原理和方法，并对羧甲基淀粉取代度测试的方法进行了详细的介绍。
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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