从力学观点分析了钻孔方位角和顶角变化的原因；
The reasons for large variations of azimuthal and zenithal angles of holes drilled are investigated with a view point of mechanics.
斜仪是一种测定钻孔倾角和方位角的仪器。
Inclinometer is an Instrument testing drift Angle and azimuth of drift hole.
斜仪是一种测定钻孔倾角和方位角的仪器。
Inclinometer is an Instrument testing drift Angle and azimuth of drift hole.
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