单项选择题
（） should be tested and adjusted when the boiler survey is carried out.
A.The boiler oil tank B.The steam pipe C.The fire side D.The safety valves
单项选择题 Foaming in the steam drum may be caused by （） in a boiler.
单项选择题 Too much air in the furnace of an oil-fired boiler would be indicated by （）.
单项选择题 The feed water to the boiler will comprise （）.
