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单选题
通过信令信道发送的遇险报警，这种遇险报警仅含船站ID码、船位、遇险性质、航向、航速和遇险时间，其中只有（）需要人工输入或选择，其他均可自动输入。
A
航向
B
航速
C
遇险性质
D
遇险时间
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