单项选择题
Ullage measurements are taken from the top of the liquid to（）.
A.the base of the expansion trunk B.the base of the ullage port C.a line scribed within the ullage port D.an above-deck datum，usually the top of the ullage hole
单项选择题 To serve as a person in charge of transfer operations on board a self-propelled tanker，an individual must（）.
单项选择题 To determine which grades of cargo a tanker is permitted to carry you should（）.
单项选择题 The type of carrier required to file a copy of freight tariffs would be the（）.
