Refer to the exhibit. Which ephone-dn type does Phone 10 represent?（） 
- A、shared ephone-dn
- B、overlaid ephone-dn
- C、oual-line ephone-dn
- D、single-line ephone-dn
- E、dual-number ephone-dn
- F、two ephone-dns with one number
正确答案:B
答案解析:有
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