projected contact length

... 1. projected length: 投影长度 2. projected contact length: 接触弧长的投影 3. projected path length: 投影声程长度 ...

at length ... projected contact length (轧件同轧辊的)接触弧长的投影, 咬入弧水平方向投影长度 propagation length 传播距离 ...