单项选择题
A.unwatched B.surrounded by riprap C.a minor light D.constructed on an artificial island
The horizontal flat surfaces where the upper stock join...
单项选择题The horizontal flat surfaces where the upper stock joins the rudder are the（）.
A.rudder keys B.rudder palms C.lifting flanges D.shoes of the rudder
The grip of a joint represents the（）.A.thickness of the...
单项选择题The grip of a joint represents the（）.
A.thickness of the connected members B.diameter of the head C.entire length of the rivet D.diameter of the shank
The fluke angle of an anchor system is the angle betwee...
单项选择题The fluke angle of an anchor system is the angle between the（）.
A.flukes and the shank B.shank and the sea bottom C.mooring line and the sea bottom D.flukes and the shackle
