How should you signal the crane operator to swing?（）.<br>A:With both arms extended out and palms to down, move arms back and forth<br>B:With arm ertended downwards and forefinger pointing down,move hand in small horizontal crecles<br>C:Extend arm and point finger in the direction to move boom<br>D:Place both fists in front of the body with the thumbs pointing outward

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

出自：海船船员证

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