auxiliary datum plane 辅助基准面
erection datum plane 安装基准面
tidal datum plane [海洋] 潮汐基准面
datum plane for sounding 基准水平面
datum plane for construction 施工基准面
floating auxiliary datum plane 浮动辅助基准面
standard datum plane 标准基准面
datum plane of gauge 测站基面
Datum Plane Tool 基准平面工具
N the horizontal plane from which heights and depths are calculated 基准面 [surveying]
In this paper, the geometric characteristics of worm drive with double enveloping arc surface machined by datum-plane tool are stated.
本文阐述了平面二次包络弧面蜗杆传动的几何特征，引用数学方程对这些特征加以说明，进而提出了啮合参数选择原则。
If the element being tested with tolerance requirements is an axis, centre line or symmetrical plane, the arrow and datum symbol should be aligned to the dimension line of that element.
当被测要素为轴线、中心线或对称平面时，指引线的箭头和基准符号应与该要素的尺寸线对齐。
Currently available vernier depth gauges are simple in measuring function, especially in measuring precisely the no touchable directly depth of the measuring datum plane.
现有游标深度尺的功能单一，对测量基准面无法直接触碰的深度尺寸难以精确测量。
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