單項選擇題How should you signal the crane operator to lower the boom and raise the load?（）.

A.Extend arm and point finger in the direction to move the boom
B.Extend arm with the thumb pointing downward and flex fingers in and out
C.With f rearm vertical and forefinger pointing up,move hand in small horizond circles
D.With arm extended downwards and forefinger pointing down,move hand in small horizontal circles


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1.單項選擇題How should you signal the crane operator to move slowly?（）.

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

2.單項選擇題How should you signal the crane operator to raise the boom and lower the load?（）.

A.Extend arm with the palm down and and hold this position rigidly
B.Place both fists in front of the body with the thumbs pointing outward each other
C.Clasp hands in front of you body
D.Extend arm with the thumb pointing up, and flex the finger s in and out for as long as the load movement is desired

3.單項選擇題How should you signal the crane operator to raise the boom?（）.

A.Extend arm with the thumb pointing up and flex the fingers in and out
B.Place both fists in front of the body with the thumbs pointing upward
C.With forearm vertical and forefinger pointing up,move hand in small horizond circles
D.Extend arm with the fingers closed and thumb upward

4.單項選擇題How should you signal the crane operator to stop in an emergency?（）.

A.Extend arm with the palm down and and hold this position rigidly
B.Place clasped hands in frontof your body
C.extend arm and move hand rapidly right and left with the plam outward
D.Place both fists in front of the body with the thumbs pointing outward

5.單項選擇題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