船员四小证是什么？基本安全过期要培训吗？(海员常识百问百答61)
https://onvideo.ssrcdn.com/bs2/onVideo/skyfall/media/34252207226488336857344.mp4 腾讯https://v.qq.com/x/page/r35102sp64j.html
公众号
https://mp.weixin.qq.com/s/qot5isR5OQY9BafzgYo3qA
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https://www.ixigua.com/i7224055066901250571/
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https://haokan.baidu.com/v?vid=16834424607160862637
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https://www.jianpian.cn/a/g2j5tdw
一点号
https://www.yidianzixun.com/article/V_1dqbXg3J
优酷
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56视频
http://www.56.com/u44/v_MTgzMjg1OTkz.html
哔哩哔哩
https://www.bilibili.com/video/BV1v24y1c7rt/
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未通过审核
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https://www.iqiyi.com/v_211ihv8e3n4.html
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