（） is used for washing and drinking.

1、（） is sometimes used for piston coolin

（） is sometimes used for piston cooling since leaks into the crankcase would not cause problems.ADiesel oilBHydraulic oilCLube oilDMineral oil

2、The （） engine is used for alternators

The （） engine is used for alternators and sometimes for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.Afour-strokeBtwo-strokeCslow speedDreversible

3、A sail hook is used for（）.

A sail hook is used for（）.Ahoisting a windsailBparcelingCsewing canvasDtesting canva

4、（）is used for lifting cargo.

（）is used for lifting cargo.AA mooring winchBA windlassCA deck craneDA lifeboat

5、A bench hook is used for（）.

A bench hook is used for（）.Ahanding of cargo casesBhanding oilskingsCsewing canvasDsplicing small stuff

6、Seawater may be used for drinking wate

Seawater may be used for drinking water （）.Aat a maximum rate of two ounces per dayBafter mixing with an equal quantity of fresh waterCif gather during or immediately after a hard rainDunder no circumstance