单项选择题
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
The fitting that allows a boom to move freely both vert...
单项选择题The fitting that allows a boom to move freely both vertically and laterally is called the （）.
A.swivel B.lizard C.spider band D.gooseneck
