In vessel construction. Beam brackets are triangular plates than join the deck beam to a（）.

A.bulkheads
B.deckhouse structures
C.decks
D.vertical frames

A.the introduction of inert gas into a tank with the object of reducing the oxygen content to below 8% by volume
B.the introduction of inert gas into a gas free tank for the purpose of reducing the oxygen content to below 8% by volume
C.the introduction of inert gas into a cargo tank during cargo discharge to replace the volume of discharged cargo
D.All of the above

A.the office staff
B.the terminal staff
C.the ship's crew
D.the insurance company