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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

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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

單項(xiàng)選擇題

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

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