聚氨酯是由异氰酸酯与多元醇反应制成的一种具有氨基甲酸酯链段重复结构单元的聚合物。
PU is a polymer with urethane segment repetitive structure unit formed after the reaction of TDI and PPG.
文章介绍了永磁直线伺服单元的机械结构及重复控制的基本原理；
The mechanical structure of the permanent magnetic linear actuator as well as the control principle of the repetitive controller is introduced.
可以想象，最简单的聚合物是由一种结构物单元重复多次形成一个 线型 均聚物。
The simplest polymer which can be envisaged consists of the repetition of a single structural unit many times over to form a liner homopolymer.
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