问题
单项选择题
拖船通知被拖船舶、排筏注意，应鸣放（）。
A.一长声
B.五短声
C.一长两短声
D.一长三短声
答案
参考答案：D
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拖船通知被拖船舶、排筏注意，应鸣放（）。
A.一长声
B.五短声
C.一长两短声
D.一长三短声
参考答案：D
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