1)revolutions of spindle per minute,每分钟锭子转数2)turns of spindle per minute,每分钟锭子转数3)metres per minute,每分米数4)lines per minute (LPM; lpm),行每分5)words per minute (WPM; wpm),字每分6)per minute,每分钟7)revolutions per minute,每分转数8)rotations per minute,转数每分9)tour par minute,每分钟转10)PM,每分钟
