单选题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）（）.AExemption spaceBTonnage deckCCofferdamDTonnage opening
单选题
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
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