Too much electric current may flow into a circuit as a result either of a fault in the cir
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Too much electric current may flow into a circuit as a result either of a fault in the circuit and of an outside event such as lightning.
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正确答案：and一or
考查固定搭配。asaresultof意为“由于”，后面接原因，当中包含either一词，故可推测是用either．．．or．．．结构，表示两者选一，意为“或者……或者……”。