The approval period for a shipboard Oi

1、Where tanks are arranged for either oi

Where tanks are arranged for either oil or ballast, （） must be fitted in the pipeline.Aa change-over chestBa head tankCa emergency bilge pumpDan air cooler

2、The shipboard oil pollution emergency

The shipboard oil pollution emergency plan will be invalid after （）Aone yearBtwo yearsCfour yearsDfive year

3、Where tanks are arranged for either oi

Where tanks are arranged for either oil or ballast （） must be fitted in the pipe so that only the ballast main or the oil transfer main connected to the tank.Aa sea water chestBa change-over chestCa buffer tankDa three-way valve

4、The period of a lighted aid to navigat

The period of a lighted aid to navigation refers to the（）.Adate of construction or establishmentBlength of time between flashes of the lightCtime required for the longest flash of each cycleDtime required for the light to complete each cycle

5、If the engine （） for a long period, th

If the engine （） for a long period, there will be a danger of frost.Amust to stand inoperativeBhas to stand inoperativeCmust be stood idleDwill stand idle

6、The part of the shipboard electrical s

The part of the shipboard electrical system used to control the distribution of power to the branch circuits, is the （）.Abridge control panelBdisconnect linksCgovernor relay boxDmain switchboard