How should you signal the crane operator to hoist?（）.

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• How should you signal the crane operator to dog everthing?（）.

  A . Place both fists in front of the body with the thumbs pointing outward each other B . Clasp hands in front of your body C . Extend arm with the palm down and and hold this position rigidly D . Extend arm with the thumb pointing up, and flex the finger s in and out

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• How should you signal the crane operator to raise the boom and lower the load?（）.

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