R.

名词 r.:

1. a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
   同义词：roentgen, R
2. (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
   同义词：gas constant, universal gas constant, R
3. the 18th letter of the Roman alphabet
   同义词：R, letter r
4. the length of a line segment between the center and circumference of a circle or sphere
   同义词：radius, r

r.
abbr.（略语）
Or R. Railroad ,railway.
或 R. Railroad,railway.
Or R. Range.
或 R. Range.
Rare.
Rare.
Retired.
Retired.
Or R. Right.
或 R. Right.
Or R. River.
或 R. River.
Or R. Road.
或 R. Road.
Rod [unit of length]
Rod[长度单位]
Games Rubber.
【游戏】 Rubber.
Ruble.
Ruble.
Or R. Rupee.
或 R. Rupee.