起重机车轮与轨道间有时会发生“啃道”现象。双点接触圆顶轨道是彻底消除“啃道”现象的结构形式。
The "gnawing rail" between wheel and rail of a bridge crane occurs sometime double-point contact circular top rail is of a structure form for eliminating "gnawing rail" fully.
得出的优化方案为将原始铸造工艺中的双直浇道结构改为较为简单的单直浇道系统；
The optimum process is that, the double-gating system in original process is replaced with a single-gating system.
在双涵道的混合排气系统中，内涵出口处加装突片，外涵采用引射的方式，这是一种有别于波瓣喷管的新型掺混结构。
Tabs were used in the two-flow exhaust mixer-ejector, which compose the mixing pumping system. It is a new kind of mixer-ejector, which is different from the lobed mixer-ejector.
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