单选题How should you signal the crane operator to stop?（）.APlace both fists in front of the body with the thumbs pointing outwardBWith both arms extended out and palms to down, move arms back and forthCExtend arm with the palm down and and hold this position rigidlyDClasp hands in front of you body
单选题
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
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