Ullage measurements are taken from the top of the liquid to（）.<br>A:the base of the expansion trunk<br>B:the base of the ullage port<br>C:a line scribed within the ullage port<br>D:an above-deck datum，usually the top of the ullage hole

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

出自：海船船员证

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