C-tone (old hand player in order practice gas) D tune (adult large hand in order practice gas) E-tune (adult applicable with a whistle-blowing base) F tune (adult beginology junior high school) G tone
The applicable scenario:
Professional quasi-professional students to play the exercises
The application of the crowd:
Middle school students children college students female adults old age
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Items weight estimation 0 g, subject to actual weight
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