How should you signal the crane operator to stop in an emergency?（）<br>A:Extend arm with the palm down and hold this position rigidly<br>B:Place clasped hands in front of your body<br>C:Extend arm and move hand rapidly right and left with the palm down<br>D:Place both fists in front of the body with the thumbs pointing outward

How should you signal the crane operator to stop in an emergency?（）
A:Extend arm with the palm down and hold this position rigidly
B:Place clasped hands in front of your body
C:Extend arm and move hand rapidly right and left with the palm down
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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