单项选择题
The term length of a vessel in International Regulations for Preventing Collision at Sea 1972 means（）.
A.the length between perpendiculars B.the registered length C.the length overall D.the length of waterplane on summer draft
单项选择题 The ship should have a slightly deeper draft（）.
单项选择题 The ship has（）of more than 10 meters at full load.
单项选择题 The primary purpose of a load line is to establish required（）.
