单选题The light rhythm of Morse (A) is shown on（）.Apreferred-channel buoysBstarboard- or port-side buoysCspecial marksDsafe water buoys
单选题
The light rhythm of Morse (A) is shown on（）.
A
preferred-channel buoys
B
starboard- or port-side buoys
C
special marks
D
safe water buoys
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