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.
inaregularfashion，规则地当重复单元由几个单体组成物规则排布，聚合物通常根据它的结构来命名。
When the repeating unit is composed of several monomeric components following each other in a regular fashion, the polymer is commonly named according to its structure.
在晶体固体结构中可以辨别出一个细胞单元其含有一个可以以精确的几何结构被无限重复的原子团。
However in crystalline solids it is possible to identify a unit cell containing a group of atoms that is repeated indefinitely in precise geometric fashion.
它与传统高分子相比分子中都含有重复的结构单元，但性质却表现出了很大的差异。
As compared with the traditional "macromolecular, they all consist of the same structural units, but it shows to be very different in properties."
它与传统高分子相比分子中都含有重复的结构单元，但性质却表现出了很大的差异。
As compared with the traditional "macromolecular, they all consist of the same structural units, but it shows to be very different in properties."
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