单项选择题
A.aspect ratio
B.constriction ratio
C.rudder ratio
D.steering ratio
单项选择题 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（）.
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（）.