单选题The test of a towing vessel’s steering gear control system includes each item EXCEPT（）.Aa test from the alternative power supply，if installedBtiming the movement of the rudder from hard over to hard overCverification that the rudder angle indicator shows the actual position of the rudder(s)Dvisual inspection of the steering linkage
单选题
The test of a towing vessel’s steering gear control system includes each item EXCEPT（）.
A
a test from the alternative power supply，if installed
B
timing the movement of the rudder from hard over to hard over
C
verification that the rudder angle indicator shows the actual position of the rudder(s)
D
visual inspection of the steering linkage
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