單項(xiàng)選擇題Always ensure that the turning gear is（）, even at the quay, the wake from other ships may turn the propeller and thus the engine.

A.disengaged
B.engaged
C.assembled
D.disassembled


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1.單項(xiàng)選擇題In general, the oil mist defectors include a base plate with air blast pumpThe function of air blast pump is to （）crankcase.

A.supply clean air to the measuring compartment of the units for more accuracy
B.generaate the pressure required for the extraction of the oil mist from the
C.generate the pressure required for the extraction of the oil mist from the crankcase
D.supply clean air to the measuring track of the units for more accuracy

2.單項(xiàng)選擇題In general, the oil mist detectors include a built-in heating unit and a compact plug for electrical connectionThe function of heating unit is to （）

A.avoid false alarms as a result of condensing water vapor
B.avoid danger of frost under very cold weather
C.reduce the viscosity of the crankcase atmosphere in order to improve the fluidity
D.keep the temperature of the oil mist detectors in an appropriate range

3.單項(xiàng)選擇題（）continuously extract the crankcase atmosphere, via a pipe system, and move it past a sensitive and accurate opacity measuring track.

A.The oil mist detectors
B.The smoke detectors
C.An oily water monitor
D.Oil discharge monitoring and controlling system

5.單項(xiàng)選擇題（）, the repair in so short a time is unknown to us.

A.How they finished
B.How did they finished
C.That how they finished
D.That how did they finished