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27. How should you signal the crane operator to STOP in an emergency?
(A) Extend arm with the palm down and hold this position rigidly.
(B) Place clasped hands in front of your body.
(C) Extend arm and move hand rapidly right and left with the palm down.
(D) Place both fists in front of the body with the thumbs pointing outward.

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 【站僕】摩檸Morning：有沒有達人來解釋一下?
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27. How should you signal the crane oper..-阿摩線上測驗