Which tensioning device is used with chain to secure heavy vehicles aboard Ro-Ro vessels（）.<br>A:Chain lever<br>B:Buckle tensioner<br>C:Adjust-a-matic tensioner<br>D:Ratchet tensioner

Which tensioning device is used with chain to secure heavy vehicles aboard Ro-Ro vessels（）.
A:Chain lever
B:Buckle tensioner
C:Adjust-a-matic tensioner
D:Ratchet tensioner

出自：海船船员证

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