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單項選擇題

How should you signal the crane operator to stop in an emergency?（）.

A.Extend arm with the palm down and and hold this position rigidly
B.Place clasped hands in frontof your body
C.extend arm and move hand rapidly right and left with the plam outward
D.Place both fists in front of the body with the thumbs pointing outward

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單項選擇題

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

A.Place both fists in front of the body with the thumbs pointing outward
B.With both arms extended out and palms to down, move arms back and forth
C.Extend arm with the palm down and and hold this position rigidly
D.Clasp hands in front of you body

單項選擇題

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

A.With both arms extended out and palms to down, move arms back and forth
B.With arm ertended downwards and forefinger pointing down,move hand in small horizontal crecles
C.Extend arm and point finger in the direction to move boom
D.Place both fists in front of the body with the thumbs pointing outward