r

英[ɑ:(r)]美[ɑ:(r)]

n.
字母r

同：	[n.] gas constant, letter r, radius, roentgen

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] r, roentgen
(physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
[同] gas constant, r, universal gas constant

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