Before entering a tank，always check th

1、Before welding can be done in a tank t

Before welding can be done in a tank that has carried petroleum products，a certificate must be obtained from（）.Athe CustomsBthe Register Bureau of ShippingCthe Shipyard Fire DepartmentDa certified gas chemist

2、Before assuming command of a vessel，th

Before assuming command of a vessel，the new OOW must discuss with the one being（），all important operational features of the ship.AreceivedBretrievedCrelievedDresumed

3、Before entering the chain locker，you s

Before entering the chain locker，you should（）.Ahave someone standing byBmake sure there is sufficient air within the lockerCde-energize the windlassDAll of the above

4、Before entering an ice area，the ship s

Before entering an ice area，the ship should be（）.Aeither trimmed by the head or the sternBon an even keelCtrimmed down by the headDtrimmed down by the ster

5、Before welding can be done in a tank t

Before welding can be done in a tank that has carried petroleum products，a certificate must be obtained from（）.Athe customsBthe Register Bureau of shippingCthe shipyard fire departmentDa certified gas chemist

6、Children need to be（）before entering s

Children need to be（）before entering school.AsocializedBcentralizedCwarned offDcared for