单项选择题
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
单项选择题 Which method should be used to secure a manila line to bitts（）.
单项选择题 Which material should NOT be used to secure cargo on deck for a voyage（）.
单项选择题 Which lashing materials would be used in securing light vehicles aboard Ro-Ro vessels（）.
