... relative motion 相对活动 relative opening 相对孔（物镜） relative parallax 相对视差 ...
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相对孔径 [天] relative aperture ; APERTURE ; relative e aperture
相对孔隙度 fractional porosity ; relative porosity ; absolute porosity
广义相对孔径 generalized relative aperture
加速乒直相对孔径 vertical accelerator relative aperture
大相对孔径物镜 lens of wide aperture
有效相对孔径 [摄] effective relative aperture
大相对孔径 Large relative aperture ; F-No
相对孔物镜 relativeopening
大相对孔径摄影物镜 object lens of large relative aperture
斜面上钻孔与平面上钻孔相比，由于加工初期条件差，孔的相对位置精度低，刀具更容易折损。
Drilling on inclined surfaces has such problems as the decrease of hole accuracy and damage of tools compared with the drilling on flat surfaces.
相对于用常规的手工方法加工孔，钻模使得钻孔、铰孔和攻丝速度快很多而且精度更高成为可能。
Jigs make it possible to drill, ream, and tap holes at much greater speeds and with greater accuracy than when the holes are produced by conventional hand methods.
应用LCP时，相对骨折处而言螺孔位置也非常重要。
The positions of the screw holes actually used relative to the fracture are also very important when LCP are used.
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