This system is based on the principle that speed multiple time equals length. With sound-control circuit and a single chip, the equipment can measure, check, display, print etc.

该系统基于速度乘以时间等于距离的原理，运用声控电路和单片机，具有测量、校准、显示、打印等功能。

youdao

This system is based on the principle that speed multiple time equals length. With sound-control circuit and a single chip, the equipment can measure, check, display, print etc.

该系统基于速度乘以时间等于距离的原理，运用声控电路和单片机，具有测量、校准、显示、打印等功能。

youdao