The master should（）necessary precautions to prevent accidents or damage.

A.increase ship's speed
B.slow down ship's speed
C.make up ship's speed
D.fix up shp's speed

A.to avoid the rearrangement of the cargo loaded on board
B.to ensure the safety of the ship and cargo
C.to reject the damaged cargo during loading operation
D.to prevent the spontaneous combustion of the coal and grain

A.experience from practice
B.various types of cargoes
C.different types of ships
D.personal abilities