弧分 minute of arc
- 定量方面:任一空间分辨力的测定结果,例如观测者恰可察觉分离的两个相邻物体(点或线或其他特定刺激)的用弧分表示的角度间隔的倒数。
Quantitatively: Reciprocal of the value (generally in minutes of arc) of the angular separation of two neighboring objects (points or lines) which the eye can just perceive as being separate. - 角球区:以边线和球门线交叉点为圆点,以1米为半径,向场内各画一段四分之一的圆弧,这个弧内地区叫角球区。
Corner Area: The edge line with the goal line cross, have a dot, radius is 1m, drawing a quarter of circle arc. - 氦的体积分大于75%时,其电弧形成具有氦弧的性质。
When the helium content in the tri-mixed gas excesses 75%, the arc presents the characteristic of helium.
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