How should you signal the crane operator to raise the boom?（）.<br>A:Extend arm with the thumb pointing up and flex the fingers in and out<br>B:Place both fists in front of the body with the thumbs pointing upward<br>C:With forearm vertical and forefinger pointing up,move hand in small horizond circles<br>D:Extend arm with the fingers closed and thumb upward

How should you signal the crane operator to raise the boom?（）.
A:Extend arm with the thumb pointing up and flex the fingers in and out
B:Place both fists in front of the body with the thumbs pointing upward
C:With forearm vertical and forefinger pointing up,move hand in small horizond circles
D:Extend arm with the fingers closed and thumb upward

出自：海船船员证

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