関連ワード:  a unitless quantity never has a non zero dimension    a unitless quantity never has    a dimensionless quantity never has a    a dimensionless quantity never has unit    a unitless quantity never has a non zero dimension true or false    a unitless quantity never has a non zero dimension explain    a unitless quantity never has a non zero dimension is it true    a unitless quantity never has a dimension    a unitless quantity never has a zero dimension    a unitless quantity never has a non zero dimension means