One of the signals，other than a distress signal，that can be used by a rescue boat to attract attention is a/an（）.<br>A:red star shell<br>B:searchlight<br>C:burning barrel<br>D:orange smoke signal

One of the signals，other than a distress signal，that can be used by a rescue boat to attract attention is a/an（）.
A:red star shell
B:searchlight
C:burning barrel
D:orange smoke signal

出自：海船船员证

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