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.
而攻方没人员地限制，除发球队员外其他全数站在射门弧外，当球被发出后两边队员才干进入射门弧。
And the offense no people, in addition to serve the limit players all the rest standing in the shot, when the ball was arc issued players can enter shot arc.
该书大部分都是关于他们实际存在一些的问题—外扩的线条，垂曲弧，穹型拱顶。
Much of the book is about their practical problems-thrust lines, the catenary curve and groin vaulting.
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