单项选择题
The irregular black line around a charted light such as Race Rock Light indicates that it is （）.
A.unwatched
B.surrounded by riprap
C.a minor light
D.constructed on an artificial island
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相关考题
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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 -
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 -
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
