R
导读：R读音音标
英 [ɑ:(r)]美 [ɑr]
R意思解释
n.英语字母表的第18个字母； 英英释义 R[ ɑ: ]n.a unit of radiation exposure; the dose of ionizing radiation that will produ
英 [ɑ:(r)]美 [ɑr]
R意思解释
n.英语字母表的第18个字母； 英英释义 R[ ɑ: ]n.a unit of radiation exposure; the dose of ionizing radiation that will produ
R读音音标
英 [ɑ:(r)]
美 [ɑr]
R意思解释
n.
英语字母表的第18个字母；
英英释义
R[ ɑ: ]
n.
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
(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 constantuniversal gas constant
the 18th letter of the Roman alphabet
同义词：letter r
the length of a line segment between the center and circumference of a circle or sphere
同义词：radius
词组短语
r and d
abbr. 研究发展（Research and Development）r wave
非线性波双语例句
The trilled `r\' is produced by vibrating the tongue against the upper teeth.发带颤音的r，舌抬向上齿颤动而成。
