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搜题
【单选题】
首垂线是指（）。A.
过船体最前端所作的垂线
B.
过首柱前缘与夏季载重线的交点所作的垂线
C.
过首柱后缘与夏季载重线的交点所作的垂线
D.
过上甲板与首柱前缘的交点所作的垂线
拍照语音搜题，微信中搜索"皮皮学"使用
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