单选题Auxiliary boilers are divided into several classifications, one of which is（）Afire-tube controlled circulationBfire-tube supercritical circulationCwater-tube natural circulationDwater-tube express circulation
单选题
Auxiliary boilers are divided into several classifications, one of which is（）
A
fire-tube controlled circulation
B
fire-tube supercritical circulation
C
water-tube natural circulation
D
water-tube express circulation
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