Under the IALA-A Buoyage System，a green spar buoy with a triangular topmark would indicate that the buoy（）.<br>A:should be left to port when heading out to sea<br>B:may be left close aboard on either side<br>C:is on the north side of a point of interest<br>D:is marking the preferred channel

Under the IALA-A Buoyage System，a green spar buoy with a triangular topmark would indicate that the buoy（）.
A:should be left to port when heading out to sea
B:may be left close aboard on either side
C:is on the north side of a point of interest
D:is marking the preferred channel

出自：海船船员证

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