单项选择题
The internal part of boiler should be cleaned by yard if found （）.
A.scaled
B.worn
C.deformed
D.rested
点击查看答案&解析
相关考题
-
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 -
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 -
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
