datum line

The paper reports on a study of datum line s errors, in addition to comparing geodesic line with short range line while expanding various kinds of shell plates and analysis error incurring reasons and error s distribution law.

本文把不同外板展开方法的测地线和短程线进行比较，分析其误差产生的原因和分布规律，从而来研究外板展开准线的几何精度。

chart datum level

海图基准面海图基准线

British Standard Wire Gauge

英国标准线规英国标准线径规

quasilinear plasma theory

准线性等离子体理论

adjust the line of sight of (an optical instrument).

调整（光学仪器的）瞄准线。

quasi-linear feedback control system

准线性反馈控制系统

aligning and angle direction telescope

准线及角度方向测定仪

Correct the wheel alignment on a car.

修正汽车上的轮胎准线

American Standard Wire

美国标准线规美国线径规

The line of fire of an aimed weapon.

准星瞄准武器的开火线

conic projection with two standard parallels

双标准纬线圆锥投影

standard radio aids

标准无线电导航设备

The sight is aliened with the barrel.

准星与枪筒成一直线。

x ray align and exposure equipment

x 射线对准曝光装置

principal meridian of gnomonic chart

心射投影基准子午线

autoreduction alidade

曲线归算望远镜照准仪

certificate of approval of the marking

载重线标志批准证书

canonical divisor of an algebraic curve

代数曲线的标准除子

New Standard for Wireless LANs

新的无线局域网标准