17. Every vessel shall at all times maintain a proper ______ by sight and hearing as well as by all available means appropriate in the prevailing circumstances and conditions so as to make a full appraisal of the situation and of the risk of collision.
(A) inspection
(B) lookout
(C) probe
(D) scrutiny

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統計： A(48), B(520), C(12), D(10), E(0) #3187375

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