| 1. | Arc strikes outside of the welds were avoided .
焊缝外要避免电弧穿刺。
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| 2. | The beam will deflect into a circular arc .
该梁将弯成一个圆弧。
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| 3. | Arc lamps require a current-limiting ballast .
弧光灯需要一个限流镇流器。
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| 4. | The individual arcs cannot be rectified .
单个弧是不能求长的。
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| 5. | The pole swung in an arc .
杆子转了一个弧形。
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| 6. | A common laboratory source of light is provided by a mercury arc .
通常的实验室光源选用汞弧灯。
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| 7. | The indegree of a vertex v in d is the number of arcs with head .
VD中顶点V的入度是指以V为头的弧的数目。
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| 8. | If the diameter of the pupil is 6 mm the eye is able to separate 120 seconds of arc .
如果瞳孔直径为6毫米，人眼可分辨120弧秒。
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| 9. | The crack between the coped and hole was removed by air arc and then repaired by welding .
在修割边和钻孔之间的裂纹用气弧消除，然后进行焊补。
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| 10. | A radian is the angle subtended by an arc of a circle whose length is just equal to the radius .
一弧度就是长度刚好等于半径的一段圆弧所对的圆心角。
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