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

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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
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