21. A container is in distress in the position of 23°25’ North and 145°35’ West. All the vessels in vicinity of the vessel keep sharp ______. (A)watchout (B)watch (C) lookout (D) rescue

17. Your vessel was vibrated heavily at a range of numbers of revolutions of the engines because synchronization occurs between the periods of a vibration of the hull and those caused by the inertia of the reciprocating parts of engines. What do we call this speed? (A)Regulative speed. (B)Critical speed. (C)Calibrating speed. (D)Difficult speed.

21. A container is in distress in the position of 23°25’ North and 145°35’ West. All the vessels in vicinity of the vessel keep sharp ______.
(A)watchout
(B)watch
(C) lookout
(D) rescue

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