單項(xiàng)選擇題How should you signal the crane operator to dog everthing?（）.

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


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1.單項(xiàng)選擇題How should you signal the crane operator to hoist?（）.

A.With foremarm vertical and forefinfer pointing up ,move hand in small horizonal circles
B.With arm ertended downwards and forefinger pointing down,move hand in small horizontal crecles
C.Extend arm with fingers closed and thumb pointing upward
D.Place both fists in front of the body with the thumbs pointing outward

2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)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

5.單項(xiàng)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