Valves in these classes are also available with spiral wound or ring joint gaskets when specified.
如果用户要求，这些压力等级的阀门也可提供螺旋盘绕或环连接垫圈。
I did not measure that flex joint those spiral collars.
我没量那个柔性短节和螺旋钻链。
Objective To investigate the imaging methods of Spiral ct in Wrist joint and the diagnostic value in the Wrist joint trauma.
目的：探讨螺旋CT三维重建成像方法及其在腕关节损伤诊断中的价值。
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