单选题Distress traffic（）all messages relating to the immediate assistance required by the ship in distress, including search and rescue communications and signals for locating.Aconsists ofBis consisted ofCconsisted ofDare consisted of
单选题
Distress traffic（）all messages relating to the immediate assistance required by the ship in distress, including search and rescue communications and signals for locating.
A
consists of
B
is consisted of
C
consisted of
D
are consisted of
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