| 单词 | proportional radius |
| 释义 | > as lemmasproportional radius ΚΠ 1825 ‘J. Nicholson’ Operative Mechanic 21 When these two circles [representing wheel and pinion] are so placed that their outer rims shall touch each other, a line drawn from the centre of the one to the centre of the other is termed the line of centres; and the radii of the two circles the proportional radii. < as lemmas |
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