波纹管是一类子午线呈波纹状的旋转壳，作为弹性敏感元件和柔性连接件在航空仪表和管道工程中起着重要的作用。
Bellows, a shell of wrinkled meridian of revolution, is commonly used as an elastic-sensitive element in aircraft meters, and a flexible joint in pipeline systems.
镗床类主轴在最佳方位上装刀，可使加工误差最小，此方位只需被测元件一次安装和测试即可求出。
Fixing a cutting tool in best direction will make the operating error smallest. This direction can be obtained by fixing and testing the measured element only one time.
中心站设有《全国化工模型设计专业技术委员会》，先后设计开发了国内独有的、可供化工类工程装置(车间)配管模型制作的标准系列元件。
The Technology Center has set up a technical committee and developed standardized plastic model elements which are unique in China and can be used for the making of piping model of chemical plant.
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