球直径，是指与球表面相切的两平行平面间的距离。
高斯光束对标准硅球直径测量的影响分析。
Impact Analysis of Gaussian Beam on Measurement of Single Crystal Silicon Sphere Diameter.
相关分析发现，毛干直径与毛球直径呈显著正相关。
The diameter of hair bulb positively correlated with that of hair shaft.
分析球面摆线各参数、钢球直径等对传动机构自锁性能的影响。
Effects of various parameters of spherical cycloid and ball diameter on the self-lock performance of the mechanism are analyzed in detail.
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