3、采用声光作相序指示:当被测源三相相序正确时,与正相序所对应的绿灯亮;当被测源三相相序错误时,与逆相序所对应的红灯亮,并且蜂鸣器发出报警声。GRACO 204722 / H87F, AIR MOTOR, 2-1 RATIO, 6(23) GPM, 1
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