单项选择题
When a boiler is operating, the water level in the gauge glass reads （） when the boiler is shut down.
A.lower than
B.higher than
C.as much as
D.the same as
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相关考题
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单项选择题
Where an excessive level of contamination is detected an alarm is sounded and diverting valves are operatedThe discharging liquid is then passed to （）.
A.overboard
B.a bilge well
C.a slop tank
D.a hot well -
单项选择题
For the intermediate condition, thermostats must be correctly set （）.
A.by trial and error
B.by and large
C.automatically
D.very easily -
单项选择题
Most air conditioning units have （） for adjusting the ratio of recirculated fresh airCare must be taken not to reduce the fresh air so that stuffiness or smells arise.
A.catch plates
B.dampers
C.regulating valves
D.fans
