欧美日韩高清免费视频一区二区,久久精品在线视频,天天日天天操天天做,国产香蕉一区二区三区在线视频 ,色婷婷aⅴ日韩一区二区三区在线

BLHI has achieved breakthrough in R & D of quenched rolls, and filled the gap of welded quenched roll in big diameters in China. It has been put into service for Baosteel No5 Cold rolling mill project and nearly replaced expensive imported ones. Now we are applying for intellectual property and to develop new market.