R
英 [ɑ:(r)] 美 [ɑr]

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

1. 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。

权威例句

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