Which statement about tunnel bow thrusters fitted to large vessels is TRUE ________．A.They are effective on most vessels at speeds up to 10 knotsB.Because of their location，most modern installations have as much power as a tugC.They are fully effective at all draftsD.When going astern at slow speed，they provide effective steering control
Which statement about tunnel bow thrusters fitted to large vessels is TRUE ________．
A.They are effective on most vessels at speeds up to 10 knots
B.Because of their location，most modern installations have as much power as a tug
C.They are fully effective at all drafts
D.When going astern at slow speed，they provide effective steering control
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