一、弧微分（Arc Differential） 弧微分（ ） 设函数 f ( x ) 在区间 ( a, b ) 内具有连续导数， 且曲线 y = f ( x ) 上点 x, f ( x ) 的弧长为
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differential arc lamp 差接弧光灯 ; 差分作用弧灯
differential of arc 微弧 ; 弧长元素
differential of a arc [数] 微弧
Differential arc 弧微分 ; 微分弧
Arc-Length Method for Differential Equations 求解微分方程初值问题的一种弧长法
differential arc regulator [自] 差动电弧调节器
The reason the propeller shaft shortens as the Angle increases is that the rear axle and differential move in a shorter ARC than the propeller shaft.
当角度增加时，传动轴变短的原因是后桥和差速器运动的弧度小于传动轴运动的弧度。
It proved that differential diagnostic CARDS arc simply to learn and highly correct in diagnosis and so on.
证明鉴别诊断卡具有简便易学、诊断正确率高等特点。
A precise formula for equivalent load of prestressing force in curved girder of arc form is derived from the fundamental formulae of differential geometry.
由微分几何基本公式导得圆弧曲线梁中预应力等代荷载的精确公式，预应力钢索在曲梁中竖弯与平弯均较平缓，此时公式可得以简化。
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