One need repeat the previous period when playing to the repetition mark, that is, repeat the performance once more（）
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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（）
With a crotchet as one beat, how many quavers add up to make a semibreve（）
A. 8
B. 16
C. 2
D. 4
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