指标差(IE) 望远镜中水平线成一直线时, 检查指标臂上箭头所指刻划, 若在0o 之外, 称”在弧外”(off the arc),IE 以负号(-) 表示, 若在0o 之内, 称”在弧内”(on the arc),IE 以正号(+) 表示.
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缸体的实际型线是双弧外摆线的等距曲线，并由此导出其数学表达式。
The actual cylinder shaped conductor is isometric curve of double arc outside cycloid and its mathematic expression was deduced.
讨论了被外磁场驱动的滑移弧。
A gliding arc driven by the outside magnetic field is discussed.
铸坯中的大型夹杂物在厚度方向分布不均匀，内弧含量要明显高于外弧含量。
The distribution of large-sized inclusions was non-homogeneous along thickness direction of slab, which contents of inner arc slab were obviously higher than those of outer arc slab.
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