三是挂接连接件，是在U形块上有方向相反的两个U形燕尾槽榫。
One fastening is an attaching fastening, wherein, two U-shaped dovetail groove tenons in reverse directions are arranged on a U-shaped block.
如指定使用外螺纹及内螺纹或榫面及槽面法兰，容器设备口法兰端面应为凹槽型。
When male and female (M&F) or tongue and groove (T&G) type flanges are specified, the nozzle flange facing of the vessel shall be of female or groove type.
着种斗拱结构造工精致，不用一根钉子，完全采用榫头，榫槽相互衔接。
The roof structure is supported by a wood en system of brackets are connected by mortise and tendon joints and not a single nail is used for connection.
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