单项选择题

What is NOT a problem when carrying coal? （）

A.The requirement for through-ventilation
B.The corrosion some types of coal will cause to the ship
C.Spontaneous heating
D.Generation of methane gas

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单项选择题

A.Shifting cargo
B.Moving cargo
C.Removing cargo
D.Trimming cargo

单项选择题

A.centerline system of framing
B.isometric system of framing
C.longitudinal system of framing
D.transverse system of framing

单项选择题

A.stiffener
B.beam
C.stringer
D.doubler