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並前往https://www.quora.com/Why-are-the-symbols-I-O-used-for-on-and-off-in-many-electronics-The-I-and-O-are-just-examples-for-the-line-and-circle-I-usually-see

Why are the symbols (I /O) used for on and off in many ...

You are correct about the “line” and “circle.” · IEC 60417-5007, the power-on symbol (line), appearing on a button or one end of a toggle switch indicates that ...

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