单面的

Please comment whether it's cabrite's skin or fishskin?Good sword!I have one with slot at one side!

请教是藏蜥蜴皮还是鱼皮?好刀!我有一把是单面开槽!

The paper introduces single "U" groove welding procedure for stainless steel inner cylinder of multilayer high pressure vessel,opening up a new method for welding clading stainless steel vessel.

要详细介绍了内商锈钢压容器外U形坡口单面焊接工艺，从锈钢复合容器焊接开辟了一条新途径。