5. What is the meaning of “prolonged blast”?
(A) A blast of about one second’s duration.
(B) A blast of from two to three second’s duration.
(C) A blast of from four to six second’s duration.
(D) A blast of from eight to ten second’s duration.

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統計： A(17), B(45), C(85), D(17), E(0) #3009568

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避碰規則 第32條 號笛 (b) The...
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