单项选择题 A tank vessel transferring non-flammable hazardous cargo in bulk must display warning signs. These signs must（）.

单项选择题 A SYSTEM OF CLEANING THE TANKS BY WASHING THEM WITH THE CARGO OF CRUDE OIL WHILE IT IS BEING DISCHARGED is known as（）.

单项选择题 When planning the loading or discharging of a VLCC (100，000 DWT+) what is the most important consideration?（）