压载水（）A、sea waterB、bilge waterC、fresh waterD、ballast water

When started, a complete oily water separating unit is first filled ______. The oily water mixture is then pumped through the inlet pipe into the coarse separating compartment.

A.with dirty water

B.with clean water

C.by oily water

D.by mixed water

Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean ______.

A.lower low water

B.high water

C.low water

D.sea level

The cooling liquid used for the cylinder may be referred to as _____.

A.jacket water

B.make-up water

C.boiler water

D.flushing water

Prior to getting underway in fresh or brackish water，the Master must ______.

A.log the density of the water

B.secure all overboard discharges

C.take on fresh water ballast

D.clean the sides with fresh water

The soundings on the chart are based on the depth of water available at ______.

A.mean low water

B.mean lower low water

C.mean high water

D.mean high water springs

Cylinders of marine diesel engines are normally cooled by ___ .

A.sea water

B.fine mineral oil

C.sanitary water

D.fresh water

The height of a light is measured from which reference plane?

A.Mean low water

B.Mean high water

C.Average water level

D.Geographical sea level

A.water

B.safe water

C.river

D.clear water

Contour elevations on this chart refer to heights in feet above mean ______.

A.lower low water

B.high water

C.low water

D.sea level

When is the density of the water required to be logged in the logbook of a ship?

A.Any time the vessel moves from water of one density into waters of a different density

B.Prior to getting underway when the vessel is floating in fresh or brackish water

C.Only when the vessel moves from fresh water into salt water

D.The density of the water is not required to be logged in the unofficial logbook