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【单选题】
变压器的(),其动作电流整定按躲过变压器负荷侧母线短路电流来整定,一般应大于额定电流3-5倍整定。
A.
差动保护
B.
过电流保护
C.
电流速断保护
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【简答题】Sentence translation The real electronics what it is called today was actually started after the discovery of the transistor effect.
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