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You'll have too many appliances plugged in to the circuit (that the fan is on) and it could have tripped the breaker. Or even the breaker may well defective and tripped on its own without overloading.透明度和誠實:為了維護調查的可信度,調查組織應該提供其調查方法、樣本大小、抽樣方法和可能的誤差範圍等