Why is a warning sign displayed at the gangway or access point of a barge during cargo transfer（）.<br>A:To keep visitors away from the barge<br>B:To prohibit smoking<br>C:To prohibit open lights<br>D:All of the above

Why is a warning sign displayed at the gangway or access point of a barge during cargo transfer（）.
A:To keep visitors away from the barge
B:To prohibit smoking
C:To prohibit open lights
D:All of the above

出自：海船船员证

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