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.
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。
reinforced earth wall would happen not in shallow coast but in deep wedgy coast according to strain results of reinforced strips.