A、請稍等,我去給您找 B、對不起,她不在班上 C、對不起,我們工作時間不接私人電話 D、對不起,請您過一會兒再打過來
A、How do you do? B、How are you? C、How have you been? D、How are you today?
A、單音單頻 B、雙音單頻 C、單音雙頻 D、脈沖/雙音頻