A vessel is constructed with a steel hull and an aluminum superstructure. Which statement is TRUE?（）<br>A:The aluminum will provide greater resistance to the spread of fire by conduction<br>B:The aluminum structure is usually attached to a steel coaming by a method that insulates the two metals<br>C:If the superstructure is stressed，an aluminum structure requires additional expansion joints to prevent fracture<br>D:The steel at the area of the aluminum-to-steel connection must be closely checked for galvanic corrosion

A vessel is constructed with a steel hull and an aluminum superstructure. Which statement is TRUE?（）
A:The aluminum will provide greater resistance to the spread of fire by conduction
B:The aluminum structure is usually attached to a steel coaming by a method that insulates the two metals
C:If the superstructure is stressed，an aluminum structure requires additional expansion joints to prevent fracture
D:The steel at the area of the aluminum-to-steel connection must be closely checked for galvanic corrosion

出自：海船船员证

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