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BB2

BB2

如小二度音 Db.降低半音成为 C.即称减二度( bb2 ).此音亦相同完全一度( 1 ).如小三度音 Eb.降低半音成为 D.即称减三度( bb3 ). …

A pre-planned intermediate analysis was carried out after the BB1, BB2 and IV groups had recruited 68 , 48 and 65 patients , respectively .