Ullages on tankers are measured from（）.<br>A:an above-deck datum such as the top of the ullage pipe<br>B:the tank ceiling aboard transversely framed vessels<br>C:the tank top<br>D:a thievage mark below the edge of the deck

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

出自：海船船员证

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