单选题Ullages on tankers are measured from（）.Aan above-deck datum such as the top of the ullage pipeBthe tank ceiling aboard transversely framed vesselsCthe tank topDa thievage mark below the edge of the deck
单选题
Ullages on tankers are measured from（）.
A
an above-deck datum such as the top of the ullage pipe
B
the tank ceiling aboard transversely framed vessels
C
the tank top
D
a thievage mark below the edge of the deck
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