portal type meaning in English

门式, 门形

Design of a portal type rigid - frame bridge with flat arched shallow girder
一座微拱薄梁门形刚构桥设计
Accuracy of machine tools and methods of test - specification for plano - milling machines , portal type
机床精度及试验方法.第36部分:龙门铣床规范
Machine - tools . plano - milling machines , portal type . acceptance conditions and testing of accuracy
机床.通用轻便式龙门铣床.验收条件和精确度试验
The whole cast - aluminum lathe bed , portal type move , firm , durable and does not deform in permanent service , providing better positioning accuracy
整体铸铝床身，龙门式移动，坚固耐用长时间使用不变形，使定位精度更加精确。
Test conditions for high accuracy turret and single spindle coordinate drilling and boring machines with table of fixed height with vertical spindle - testing of the accuracy - portal type machines with moving table
带垂直主轴固定高度工作台的高准确度六角和单轴坐标钻床和镗床的试验条件.准确度的试验.带移动工作台的轻便式机床

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