单选题If emergency welding repairs must be made to the upper area of a fuel tank, the tank and/or adjacent compartments may need to be （）A gas freedB inertedC filled with waterD all of the above as necessary

A. Hierarchical OSPF networks need to be in one area

B. Multiple OSPF areas must connect to area 0

C. Single area OSPF networks must be configured in area 1

D. Areas can be assigned any number from 0 to 63535

E. Area 0 is called the backbone area

F. Each OSPF area need to be configured with a loopback interface

Before welding in a tank that has carried petroleum products，the tank must be certified by ______.

A.the Coast Guard

B.the ABS

C.the shipyard fire department

D.a certified marine chemist

A.will be made ( )

B.must be made

C.can be made ( )

D.be made

You are on a multiple product tanker and carrying methyl acrylate，diethanolamine，and triethylamine. Which statement is TRUE?

A.Methyl acrylate may be loaded in a tank adjacent to diethanolamine but not triethylamine

B.The heating coils to the cargo tank loaded with methyl acrylate must be blanked off

C.Valve components made of aluminum，copper，or zinc may not be in contact with the cargoes

D.Each crew member working on deck must have an emergency escape breathing apparatus

What is the best instrument for establishing a safe working area before welding in a confined space?

A.An oxygen indicator

B.A combustible gas indicator

C.A combination combustible gas and oxygen indicator

D.A flame safety lamp

Prior to burning or welding on a fuel tank on a ship，regulations require that an inspection be made. An entry in the unofficial logbook is required if this inspection is made by ______.

A.a marine chemist

B.the Officer in Charge，Marine Inspection

C.the Master or person in charge of the ship

D.the National Fire Protection Association

Sometimes it is desirable to connect a member both by riveting and welding. Which statement is TRUE concerning this procedure?

A.Tearing through the member is more likely in this type connection

B.The weld may be broken by the stresses caused by riveting

C.The weld increases the tensile stress on the rivet heads

D.The welding must be completed before the riveting commences

The journal entry to record the cost of warranty repairs that were incurred during the current period, but related to sales made in prior years, includes a debit to Warranty Expense.()

Which statement is TRUE concerning protection of double bottom tanks against excessive pressure?

A.Each vent for the tank must be equal to the area of the tank filling line

B.The tanks must be protected by overflows

C.The total area of the vents or the overflow shall be at least equal to the area of the fill line

D.There must be twice as much vent area as the area of the fill line

No deductions“______” shall be made from the cost of temporary repairs allowable as general average．

A.old for new

B.new for old

C.old

D.new