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 horizontal circles.
D
Extend arm with fingers closed and point thumb upward.
E
İlgili Sorular
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