33. Inor near an area of restricted visibility, a vessel not under command shall sound at intervals
of not more than two minutes .
(A) one prolonged blast
(B) two prolonged blast
(C) one prolonged blast followed by two short blasts
(D) one prolonged blast followed by three short blasts
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統計: A(2), B(0), C(12), D(4), E(0) #1231298
統計: A(2), B(0), C(12), D(4), E(0) #1231298