Description: a design can accommodate four groups participating Digital Answering Machine, each with a button for Responder use. Responder is the first signal to identify and latch functions, in addition to those first Responder button ineffective; Moderator set up a "reset" button, reset moderator, began Responder, the first signal differential latch circuit signals to be used indicator shows Responder groups, loudspeakers issued 2-3s sound. Fouls circuit set to advance Responder and overtime to answer (for example, 3 min) groups warning whistle, with bands indicate foul show circuit group. Points set up a circuit, each started 10 minutes preset by the moderator points, a plus one correct answer, by a relaxation time points.
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