在任何超过一般跨距间隔的跨距中不得使用管件或接头。
Fittings or splices shall not be permitted in any span that exceeds the normal span interval.
应在所有管件处以及第12.2段中规定的一般跨距间隔处为托架、管槽及转角系统提供支撑。
Supports for tray, channel, and Angle systems shall be provided at all fittings and at the normal span intervals specified in paragraph 12.2.
阐述了基于UG铣加工过程3d跨距的原理，探讨其在曲面铣削中的应用。
This paper introduces the principle in 3d Stepover of milling manufacturing process based on UG and discusses its application in surface milling.
应用推荐