20. What is the function of cardinal buoy?
(A) Indication of an isolated danger which has navigable water all round it.
(B) Indicate navigable water all around the buoy.
(C) Instruct mariners to pass on the named side of the buoy.
(D) Show the port or starboard side of the route to be followed.
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統計: A(37), B(43), C(148), D(41), E(0) #2652704
統計: A(37), B(43), C(148), D(41), E(0) #2652704