| 单词 | arc |
| 释义 | arc [ärk] ELECTRICITY See <<electric arc>> ENGINEERING The graduated scale of an instrument for measuring angles, as a marine sextant; readings obtained on that part of the arc beginning at zero and extending in the direction usually considered positive are popularly said to be on the arc, and those beginning at zero and extending in the opposite direction are said to be off the arc. GEOLOGY A geologic or topographic feature that is repeated along a curved line on the surface of the earth. MATHEMATICS 1. A continuous piece of the circumference of a circle. 2. See <<edge>> |
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