单选题Ullage measurements are taken from the top of the liquid to（）.Athe base of the expansion trunkBthe base of the ullage portCa line scribed within the ullage portDan above-deck datum，usually the top of the ullage hole
单选题
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
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