海员培训证明有用吗？培训后是不是都会给培训证明？(船员职业常识百问百答07)
https://onvideo.ssrcdn.com/bs2/onVideo/skyfall/media/34252207045982566192181.mp4 腾讯https://v.qq.com/x/page/p35076jo69j.html
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https://www.bilibili.com/video/BV1um4y1z75q/
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