船员学习多久？四小证一般培训多长时间？（海员知识问答2023版_925期）
https://onvideo.ssrcdn.com/bs2/onVideo/skyfall/media/34252206655953228028987.mp4 腾讯https://v.qq.com/x/page/t3502xt2ohu.html
公众号
https://mp.weixin.qq.com/s/m_3_cgCDAgWWEyMeJLY9AA
今日头条
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百家号
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美篇
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一点号
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优酷
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56视频
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哔哩哔哩
https://www.bilibili.com/video/BV1f54y1u7FV/
搜狐
https://tv.sohu.com/v/dXMvMTg5NTY1NTI1LzQyNjU2ODE5NS5zaHRtbA==.html
爱奇艺
https://www.iqiyi.com/v_da7zf2zcf8.html
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