datum point [计] 基准点
- The deepest point is66 metres below Principal Datum in Lo Chau Mun( Beaufort Channel) north of Po Toi Island.
最深的地方则位于蒲台岛以北的螺洲门,低于海拔66米。 - During the process of camshaft measurement, the phase datum of the key pin or the locating pin can be determined precisely by using the minimum error method of curve symmetry and the cam nose position can be determined by usin
在凸轮测量中,采用曲线对称最小误差法,可精确确定键销或定位销的相位基准;采用“敏感点”附近最小误差法,可精确确定凸轮“桃尖”位置。
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