单项选择题
A.filling a partially filled tank
B.using fuel from a pressed fuel tank
C.emptying a partially filled tank
D.transferring pipe from the setback area to the pipe rack
单项选择题 A vessel is equipped with cross-connected deep tanks. In which situation should the cross-connection valve be closed?（）.
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（）.