单项选择题
Right at the top is（）It is 300 mm long and 25 mm wide with its upper edgs in line with the uppermost continuous watertight deck.
A.the deck line B.Plimsoll disc C.Plimsoll line D.sunmmer load line
单项选择题 （）is from baseline to top of the upper deck breadth at the ship’s side amidships.
单项选择题 （）is the depth of the vessel at ship’s side from the upper deck to the lowest point of the keel.
单项选择题 （）is measured from the baseline to the summer loadline at the midship section.
