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A red triangular daymark marks ______.
A.the centerline of a navigable channel
B.the starboard side of a channel
C.a prominent object of navigational interest that has no lateral significance
D.an area of a channel where passing another vessel is permitted
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单选题A red triangular daymark marks（）.A
the centerline of a navigable channelB
the starboard side of a channelC
a prominent object of navigational interest that has no lateral significanceD
area of a channel where passing another vessel is permitted
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an area of a channel where passing another vessel is permitted
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the centerline of the channelC
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Serves no significant purpose
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