单项选择题
A.to the top to expel all vapors from the tanks
B.to the top so the operator is certain how much fuel he has aboard
C.with only sufficient fuel for the planned trip so excess gasoline is not carried
D.to near the top with some space allowed for gasoline expansion
单项选择题 Generally speaking , the heavier cargo will go into the（）,distributing it evenly fore and aft, the lighter cargo will probably be placed in the（）.
单项选择题 Holes in the bulwark,Which allow deck water to drain into the sea, are（）.
单项选择题 How should cargo tank hatches be protected when the ullage opening is open and the tank not gas free?（）.