单选题How should you signal the crane operator to use the main hoist?（）.AUse one hand to give any miotion signal , and place the other hand motionless in front of the hand giving the motion signalBExtend 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 first , and then proceed to use regular signals
单选题
How should you signal the crane operator to use the main hoist?（）.
A
Use one hand to give any miotion signal , and place the other hand motionless in front of the hand giving the motion signal
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 first , and then proceed to use regular signals
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