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																			n.
																					名词
										
										
																					- 英语字母中的第十八个字母(小写为r)
- 半径(radius)的符号
- 中世纪罗马数字的80
- R音
- R的活字
- 表示“第十八”的符号
- 伦琴射线,X射线(roentgen)的符号
- 卢布(ruble)
 
 
 
 
 
						
							
							
								
																	Noun:
									
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										a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air										
																				 
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										(physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole										
																				 
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										the 18th letter of the Roman alphabet										
																				 
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										the length of a line segment between the center and circumference of a circle or sphere										
																				 
 
 
 
 
 
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