A well in the uppermost deck of a shelter deck vessel which has only a temporary means of closing for the purpose of gaining an exemption from tonnage measurement is called a（n）（）.<br>A:Exemption space<br>B:Tonnage deck<br>C:Cofferdam<br>D:Tonnage opening

A well in the uppermost deck of a shelter deck vessel which has only a temporary means of closing for the purpose of gaining an exemption from tonnage measurement is called a（n）（）.
A:Exemption space
B:Tonnage deck
C:Cofferdam
D:Tonnage opening

出自：海船船员证

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