将三线合一的电线剥开，露出三条线； 找到“地线”，黄色带一条绿色线的为“地线”，如图，也就花色的线就是地线；
I was thinking to a function that check the key value pressed, and accept only the most common characters, canc, enter, ... because i need it only for basic ascii character set (not ñ, č, ch开发者_S
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