If separating effect is not good which measure should be taken ____.A.working at interval

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If separating effect is not good, which measure should be taken ____.

A.working at intervals and properly heating

B.warming up to 70℃, increase water supply flow

C.improving impulse of water supply

D.reducing water supply flow

请帮忙给出正确答案和分析,谢谢!

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