（）, iea steam cooler, may be filled in the boiler system to control the superheated steam temperature.<br>A:An economizer<br>B:An attemperator<br>C:A water dram<br>D:A down-comer tube

（）, 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

出自：海船船员证

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