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You will have too many appliances plugged in the circuit (that the supporter is on) and it may have tripped the breaker. Or the breaker may perhaps defective and tripped By itself with out overloading.限制:雖然民意調查是一個有價值的工具,但它也有其限制。例如,樣本可能不完全代表目標人群,或者問卷的�