How should you signal the crane operator to lower the boom and raise the load（）.<br>A:Extend arm and point finger in the direction to move the boom<br>B:Extend arm with thumb pointing downward and flex fingers in and out<br>C:With forearm vertical and forefinger pointing up，move hand in small horizontal circles<br>D:With arm extended downwards and forefinger pointing down，move hand in small horizontal circles

How should you signal the crane operator to lower the boom and raise the load（）.
A:Extend arm and point finger in the direction to move the boom
B:Extend arm with thumb pointing downward and flex fingers in and out
C:With forearm vertical and forefinger pointing up，move hand in small horizontal circles
D:With arm extended downwards and forefinger pointing down，move hand in small horizontal circles

出自：海船船员证

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