问题
单项选择题
In the GMDSS, distress alerting can be transmitted in（）directions.
A.1
B.2
C.3
D.4
答案
参考答案：C
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In the GMDSS, distress alerting can be transmitted in（）directions.
A.1
B.2
C.3
D.4
参考答案：C
mgtgθ
mgsinθ