r_单词r_r的解释和用法

名词复数: r's

r基本解释

n.字母r

r同义词

r英英释义

Noun:

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