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.
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