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单选题
How should you signal the crane operator to move slowly().
A

Use one hand to give any motion signal,and place the other hand motionless in front of the hand giving the motion signa

B

Extend arm with the thumb pointing up,and flex the fingers in and out for as long as the load movement is desired

C

First tap your elbow with one hand and then proceed to use regular signals

D

First tap the top of your head with your fist and then proceed to use regular signals


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