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SCIENCE STUDY

总第677期 Sample puzzle 参考答案

作者:TEENS
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Turn on switch 1 and leave it on for a few minutes, then turn it off. Turn on switch 2 and open the door. If the light bulb is on, switch 2 controls it. If it is off and warm, switch 1 controls it. And if it is off and cold, switch 3 controls it.

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