单选题（）, iea steam cooler, may be filled in the boiler system to control the superheated steam temperature.AAn economizerBAn attemperatorCA water dramDA down-comer tube
单选题
（）, iea 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
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