单项选择题
A.scaled B.worn C.deformed D.rested
At normal sea going, we use （） instead of donkey boiler...
单项选择题At normal sea going, we use （） instead of donkey boiler.
A.a heater B.a pre-heater C.an exhaust gas boiler D.the coal burning boiler
The soot blowers are operating in the oil fuel boiler t...
单项选择题The soot blowers are operating in the oil fuel boiler the air/fuel ratio must （） throughout the action, and blowers greased after use.
A.be increased B.be decreased C.remain constant D.either be increased or remain constant
Water evaporates or steam condenses at the saturation t...
单项选择题Water evaporates or steam condenses at the saturation temperature, which depends upon the pressure, the higher the pressure （） the saturation temperature.
A.the more B.the higher C.the lower D.the highest
