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n.
名詞
- 英語字母中的第十八個字母(小寫為r)
- 半徑(radius)的符號
- 中世紀羅馬數字的80
- R音
- R的活字
- 表示“第十八”的符號
- 倫琴射線,X射線(roentgen)的符號
- 盧布(ruble)
Noun:
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a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
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(physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
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the 18th letter of the Roman alphabet
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the length of a line segment between the center and circumference of a circle or sphere
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