1 has the function of displaying 24 seconds. 2 the external operation switch is set up to control the direct zero, start and suspend / continuous function of the counter. The 3 timer is timed by 24 seconds, and the time interval is one second. Timer timing decreasing to zero, the digital display can not be off, and send out alarm signals

Filename	Size	Update
篮球比赛计时器的设计.docx	3399047	2017-12-15

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