_____, i.ea steam cooler, may be filled in the boiler system to control the superheated st

_____, i.ea steam cooler, may be filled in the boiler system to control the superheated steam temperature.

A.An economizer

B.An attemperator

C.A water dram

D.A down-comer tube

请帮忙给出正确答案和分析，谢谢！

参考答案

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