单选题Entering from sea,a daymark on the port side of the channel would be indicated on a chart by a（）.Ared triangle with the letter RBwhite triangle with the letters RGCgreen square with the letter GDwhite square with the letter GR
单选题
Entering from sea,a daymark on the port side of the channel would be indicated on a chart by a（）.
A
red triangle with the letter R
B
white triangle with the letters RG
C
green square with the letter G
D
white square with the letter GR
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