With a crotchet as one beat, how many beats does the dotted semibreve have（）
A. 5 beats
B. 4 beats
C. 8 beats
D. 6 beats
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One need repeat the previous period when playing to the repetition mark, that is, repeat the performance once more（）
EDI的中文解释是（）
A. 电子数据交换
B. 企业数据传输
C. 企业资源计划
D. 电子资金转账
What are the clefs in the piano（）
A. bass
B. The sub-bass clef
C. Sub-treble clef
D. Treble
The five lines and four spaces of the staff can sufficiently represent all the registers of the piano（）
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