问题
单项选择题
Vertically below the deckline is a circle whose outside diameter is 300mm.It is called the（）.
A.the deck line
B.Plimsoll disc
C.Plimsoll line
D.summer load line
答案
参考答案：B
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Vertically below the deckline is a circle whose outside diameter is 300mm.It is called the（）.
A.the deck line
B.Plimsoll disc
C.Plimsoll line
D.summer load line
参考答案：B