单选题How should you signal the crane operator to move slowly（）.AUse one hand to give any motion signal，and place the other hand motionless in front of the hand giving the motion signaBExtend arm with the thumb pointing up，and flex the fingers in and out for as long as the load movement is desiredCFirst tap your elbow with one hand and then proceed to use regular signalsDFirst tap the top of your head with your fist and then proceed to use regular signals
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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