Smart Mathematicians Lower Primary-48 Power Failure

Smart Mathematicians Lower Primary-48 Power Failure
The light switch was on before the power failure. If the switch is pressed once, it is set to the ‘off’ position. The lights will be off when the power returns. If the switch is pressed twice, it is set to the ‘on’ position.The light will be on when the power returns.

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關鍵字詞: 數學

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