用红外吸收光谱法表征了聚邻氨基酚薄膜，认为该聚合物具有梯形结构，其中吩恶嗪环作为电活性点。
The characterization of the PAP film by infrared spectroscopy suggested that the PAP is a ladder polymer with phenoxazine rings as electroactive sites.
新型活塞环综合检测仪就是一种能同时测量梯形或楔形活塞环的环高与梯形角的综合测量仪。
New type piston ring synthetic measurement instrument is the instrument which can measure both the height and trapezoid Angle of the keystone piston ring and wedgy piston ring.
另可根据客户的不同需求和用途制作成圆片式，环式，梯形，方形，弧形等各种形状。
According to the different needs of customers and make use of chip, round, square, arc, trapezoidal shape, etc.
论文首先讲述了我国目前大部分工厂活塞环检测仪器的现状及传统的梯形角与环高的测量方法，分析了它们的特点和局限性。
The paper begins with the introduction of traditional methods to measure the trapezoid angle and the ring height, analyzes their characters and limits.
安装时应将橡胶密封圈四周，梯形螺纹内，压环油槽内，中心管外径上涂黄油。
The grease should be laid on the periphery of seal ring, the inner of ladder-shaped screw thread and chuck ring oil channel during installation.
安装时应将橡胶密封圈四周，梯形螺纹内，压环油槽内，中心管外径上涂黄油。
The grease should be laid on the periphery of seal ring, the inner of ladder-shaped screw thread and chuck ring oil channel during installation.
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