The valve that prevents water from bac

1、Now that the valve is not worth （）, I

Now that the valve is not worth （）, I suggest it （）.Ato repair；to renewBrepairing；be renewedCrepairing；will be renewedDto repair；to be renewed

2、A loud clicking noise from the valve c

A loud clicking noise from the valve compartment of an operating diesel engine would indicate（）Aworn valve seatsBworn main bearingCexcessive valve clearanceDweak rocker arm spring

3、The boiler feed water check valves are

The boiler feed water check valves are located on the （）Afeed pump suction lineBhot wellCshell of the feed heaterDfeed lines to the boiler

4、The distance from the still water leve

The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.Aair gapBfreeboardCpenetrationDwater depth

5、The ocean bottom that extends from the

The ocean bottom that extends from the shoreline out to an area where there is a marked change in slope to a greater depth is the（）.Aabyssal plainBcontinental shelfCborderlandDoffshore terrace

6、Water in the fuel can prevent the engi

Water in the fuel can prevent the engine from starting, prevent it from developing full power, or （）Arun at an irregular speedBcreate high lube oil temperatureCcause the engine to over-speedDcause blue smoke in the exhaust