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从A大调的主音do(A)向下推小三度是#F小调的主音la(#F)。两者是关系大小调,调号相同:#F小调的音阶练习,望扩硫习料
A minor third from the main note do (A) in A major is laureate #F in #F minor. The two are the relationship between tone, the same tone number: # F minor scale practice, hope to expand sulfur materials