Be like what use on fanner is key board switch, should two do not bolt at the same time the phenomenon of linkage appears, and every key is in press and should freely neatly when restoration;

• 若电风扇上使用的是琴键开关，则不应该有两键同时联动的现象出现，而且每个键在按下和复位时都应该灵活自如；