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单选题
As for an oil-fired boiler if at a normal steaming condition and water goes out of sight in gauge glasses the action you should take is: （） (1) secure oil to fires (2) increase feed pump pressure
A
（1）
B
（1）and（2）
C
（2）
D
neither（1）nor（2）
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单选题Too much air in the furnace of an oil-fired boiler would be indicated by （）.A
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单选题The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.A
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yellowish flameB
golden yellow flameC
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