单项选择题
A vessel is equipped with cross-connected deep tanks. In which situation should the cross-connection valve be closed?（）.
A.The tanks lie above the waterline and are filled B.The tanks are partially filled with dry cargo C.The tanks are partially filled with liquid cargo D.The tanks are filled and lie below the waterline
单项选择题 A tankerman who permits or causes oil to go into a navigable waterway may be punished federally by（）.
单项选择题 A tank which is NOT completely full or empty is called（）.
单项选择题 A tank vessel transferring non-flammable hazardous cargo in bulk must display warning signs. These signs must（）.
