A.propeller
B.flying wheel
C.main engine
D.crankshaft
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A.coke deposits
B.cylinder water temperature
C.asphalt in fuel oil
D.lub oil
A.changed accordingly
B.unchanged
C.positioned ahead
D.positioned astern
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（） is not installed on the main switchboar.
The condensers located in various stages of a flash evaporator are cooled by（）
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）
When does auxiliary burner of incinerator put into operation? （）Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish
The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the（）