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18.Shackle is an U-shaped ______ closed with a pin used for connecting purposes.
(A)cast iron
(B)steel
(C)link
(D)loop


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 【站僕】摩檸Morning:有沒有達人來解釋一下?
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18.Shackle is an U-shaped ______ closed ..-阿摩線上測驗