单项选择题
A.starting air pressure too high B.correct timing of starting air valves C.three of the starting valves stuck D.the turning gear disengaged
When turning the engine with turning gear, you should k...
单项选择题When turning the engine with turning gear, you should keep the indicator cocks （）.
A.attached to the indicators B.opened C.closed D.broken
When to remove scale from the cooling spaces, acid solu...
单项选择题When to remove scale from the cooling spaces, acid solution （） in the system can be tested from time to time by putting some on to a piece of lime.
A.strength B.dense C.percentage D.velocity
When the water produced from most evaporator is supplie...
单项选择题When the water produced from most evaporator is supplied for drinking purpose, it must be treated to ensure it is biologically pure and （）.
A.slightly acidic B.slightly alkaline C.no salty D.slightly bitter
