Masts are usually rectangular or trapezoidal in shape and offer a very good stiffness, important to land rigs whose mast is laid down when the rig is moved.
桅架的形状一般呈矩形或者梯形。具有很好的刚度，对于陆地钻机而言非常重要，当钻机移去时，桅架需要放倒。
The separate flushing(air) system can be connected with shank adaptors by internal or external rope thread or trapezoidal thread . The customers can order according to their own requirements.
旁侧供水（风）系统钎尾有内外波形、梯形螺纹连接，用户可根据需要单独订货。
The stability of steel radial gates used in reservoirs, hydroelectric power stations, etc. is studied by modelling them as rectangular, trapezoidal or triangular frames.
在水库、水电站等工程中，对于弧形钢闸门的稳行性，根据弧门的构造可将主框架视为矩形、梯形和多层三角形框架进定分析。
The stability of steel radial gates used in reservoirs, hydroelectric power stations, etc. is studied by modelling them as rectangular, trapezoidal or triangular frames.
在水库、水电站等工程中，对于弧形钢闸门的稳行性，根据弧门的构造可将主框架视为矩形、梯形和多层三角形框架进定分析。
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