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 pressureA（1）B（1）and（2）C（2）Dneither（1）nor（2）
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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