Oxygen corrosion in auxiliary boilers is prevented by treating the boiler feed tank with either sodium （）

A、sulfite or hydrazine

B、sulfite or hygroscopic sulfite

C、bromide or hydrazine

D、bromide or hygroscopic sulfite

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第1题

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第2题

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第3题

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第4题

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第5题

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第6题

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第7题

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