单项选择题
A.when a new Master assumes command B.daily，at 0800 local zone time C.weekly，before 2400 Saturday D.immediately after assuming the watch
The irregular black line around a charted light such as...
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
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
