51久久夜色精品国产水果派解说_中国偷拍老肥熟露脸视频_日本簧片在线观看_精品成品国色天香卡一卡二卡三

Rough opening: Under the larger load of the machine tool, the largest possible tool should be selected for most local conditions, the largest possible feed amount, and the fastest possible feed. Under the condition of the same knife, the feed is proportional to the amount of feed. Under normal ci...

 Repetitive production parts processed by CNC lathes: the use of CNC grinders accounts for a relatively high proportion of process preparation man-hours