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B，外加电流保护法中，将被保护的金属与另一附加电极组成电解池。被保护的金属若与电源负极相连，则金属为电解池的阴极，发生还原反应而被保护；若与电源正极相连，则金属为电解池的阳极，发生氧化反应而被腐蚀掉
B，因为如果是正电荷的话会失去正电荷。从而达不到防腐的目的。若是负电的话。可以吸引正电荷。
(B)在外加电流保护法中,被保护金属与电源正极相连;
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