A system of cleaning the tanks by wash

1、The exhaust system of a diesel engine

The exhaust system of a diesel engine is usually designed to remove exhaust gases and to （）Aprovide exhaust back pressureBprevent exhaust smoke emissionsCpower a reciprocating superchargerDmuffle exhaust gas noise

2、The principle of separation by which a

The principle of separation by which all commercially available oily water separators function is （） differential between oil and water.Athe temperatureBthe viscosityCthe gravityDthe size

3、On a tank vessel, which of the followi

On a tank vessel, which of the following substances would be burning in a class "B" fire?（）AOilBWoodCRagsDElectrical wiring

4、Before a tank is to be crude oil washe

Before a tank is to be crude oil washed，the oxygen content in the tank must be measured at a position（）.Aimmediately above the level of the oilBat the top of the tankCin the vent riserDone meter from the deck

5、A journal kept by the officer of the w

A journal kept by the officer of the watch in which day to day happenings are recorded regarding the deck department is the（）.Acargo record bookBdeck rough logCbell bookDOfficial Logbook

6、You are cleaning the tanks after carry

You are cleaning the tanks after carrying a cargo of crude oil. Which statement is TRUE? （）AWashing water should be recirculated if possible...