... position circle 位置圈 position micrometer 方位测微计 positional astronomy 方位天文学 ...
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The position of the rod is determined by a micrometer screw gauge or spherometer.
杆的位置由千分尺螺丝规或球度计确定。
The systematic error of the circle reading micrometer is an important factor to influence on the accuracy of the diameter correction and of the position measurements of the circle.
度盘测微器系统误差是影响度盘对径改正精度和度盘位置测定精度的重要因素。
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