单词	钾40氩40定年
释义	钾40氩40定年potassium 40-argon 40 dating
随便看	operation definition operation department operation description operation desert storm operation detail operation detail additional description operation detail form operation detail-- operating detail operation detail， operating detail operation device operation diagram operation directive operation directive--od operation directive，od operation dispatcher operation dispatcher (od) operation division head operation efficiency operation element file operation error operation exception operation expression operation facility operation factor operation, fail-safe