First, turn on two switches then go upstair
If light on, take out the bulb and come down. Measure if there still current go through the switch.
I admit it is not good as your answer but still durable
If light on, take out the bulb and come down. Measure if there still current go through the switch.
I admit it is not good as your answer but still durable
選擇“Disable on www.wenxuecity.com”
選擇“don't run on pages on this domain”
