黄色影音日本成人先锋,大屁股女人操逼的视频有吗一区二区三区的,亚洲天堂二区在线,成人亚洲精品AV

Workpiece temperature workshop

About Us

Shaanxi Derui Precison Mach... ...

News

The principle of hole machining

Whatistheworkingprincipleofprecisionholemachining?Whentheprecisionholeisusedtoprocessthecircularhole,thecathodeshouldberotatedatacertainspeedtoimprovetheshapeaccuracyofthehole.ECMcanbeusedtoprocesssmallandsmallholeswithlargeaspectratio,suchascoolingh

Picture

Links

Shanxi Derui Precision Machinery Co., Ltd Hot search:機(jī)床 ,進(jìn)口機(jī)床
Shanxi Derui Precision Machinery Co., Ltd Copyright Address:Xi'an, Shaanxi ,China Sitemap
Tel:86-29-88788236 Fax:86-29-88788236 PostCode:710086 E-mail:deruimachinery@foxmail.com
Record number: Management landing Technical support:機(jī)床商務(wù)網(wǎng)