Elevation difference by trigonometric leveling shall be corrected by spherical aberration.
三角高程测量高差值应进行球差改正。
Its application range, i. e. great elevation difference and bad condition of foundation, are pointed out.
指出高架式布置的应用范围，即最适宜轧线标高差较大、地基条件差的车间。
According to topographical situation of Yanan Pipeline, conduct dead weight oil transporting test a - gainst elevation difference.
根据安延管道的地形情况，利用高程差进行了自压输油试验。
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