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單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

For the intermediate condition, thermostats must be correctly set （）.

A.by trial and error
B.by and large
C.automatically
D.very easily

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