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r
美音音标: [ɑː(r)]
r 美音 真人发音
英音音标: [ɑː(r)]
r 英音 真人发音
英汉字典
英英字典
解释
字母;
同义
roentgen
r
词性
n
解释
a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
示例
None
同义
gas constant
r
universal gas constant
词性
n
解释
(physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
示例
None
同义
r
词性
n
解释
the 18th letter of the Roman alphabet
示例
None
同义
r
radius
词性
n
解释
the length of a line segment between the center and circumference of a circle or sphere
示例
None