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 （）.
单项选择题 The horizontal flat surfaces where the upper stock joins the rudder are the（）.
单项选择题 The grip of a joint represents the（）.
