The projecting lugs of the rudderpost which furnish support to the rudder are called（）.

单项选择题The owner or Master of a towing vessel shall ensure that all tests and inspections of gear take place and are logged（）.

A.on each watch，immediately before being relieved
B.before embarking on a voyage of more than 24 hours
C.daily，at 1200 local zone time
D.weekly，before 0000 Sunday

单项选择题The owner or Master of a towing vessel shall ensure that all tests and inspections of gear take place and are logged（）.

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

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

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