1.
Specifications for the third and fourth order leveling
GB12898-1991国家三、四等水准测量规范
2.
Applied Study of Substituting GPS Elevation for Fourth-grade-leveling Elevation
GPS高程代替四等水准高程的应用研究
3.
The paper expounds the principle of triangular elevation surveying and its accuracy, and further presents the accuracy norm for 4(superscript th) grade of leveling surveging.
阐述全站仪三角高程测量的原理及精度，在此基础上得出达到四等水准测量的精度要求。
4.
The discuss of the precision in the GPS height replacing the 4 and 5 grade leveling
GPS测高技术代替四、五等水准测量精度探讨
5.
Feasible Research on Replacing Rand Leveling with Trigonometric Height of Infra-red Waves
红外电磁波三角高程代替等级水准可行性研究
6.
On the Key Problems of the Third Stage National First-order Levelling
国家三期一等水准测量若干问题的研究
7.
Research on Trigonometric Leveling to Replace Second-Class Leveling in Mountain Areas
用三角高程代替山区二等水准测量方法研究
8.
And take my full aim at their heads, when they were so close together, as that it would be next to impossible that I should miss my shoot, or that I could fail wounding three or four of them at the first shoot.
等他们凑在一块儿的时候,就对准他们头上开枪,准能打中目标,第一枪就能打伤他们三四个。
9.
Multiply three By four gives twelve.
三乘以四等于十二。
10.
As two is to three, so four is to six.
四比六等于二比三。
11.
Two is to three as four is to six.
二比三等于四比六。
12.
the second, third, fourth, etc power of x x
的二次、 三次、 四次等幂
13.
12 divided by 4 equals 3.
十二除以四等于三。
14.
Are they called first-class car, secondclass car and so on?
外宾: 称作一、二、三、四等吗？
15.
an ordinary seaman
[英](=[美]anapprenticeseaman)三等水兵
16.
Technology of Total Station Instrument Precise Trigonometric Leveling used for Second-Grade-Leveling Elevation Survey
全站仪精密三角高程法用于二等水准测量的技术
17.
Application and Research of Precise Trigonometric Leveling in Second Leveling in Mountainou Area along Passenger Dedicated Line
精密三角高程测量在客运专线山区二等水准测量中的应用研究
18.
Application of Precise Triangle Height in Second Order Leveling of Dayaoshan Tunnel
精密三角高程在大瑶山隧道二等水准测量中的应用