How should you signal the crane operator to lower the boom?______.
A.With arm extended and fingers closed, point thumb downward
B.With arm extended downwards and forefinger pointing down, move hand in small horizontal circles
C.Extend arm with the palm down, and hold this position rigidly
D.With hands clasped in front of your body
第1题
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
第2题
A.Extend arm with the palm down and hold this position rigidly
B.Placed clasped hands in front of your body
C.Extend arm and move hand rapidly right and left with the palm down
D.Place both fists in front of your body with thumbs pointing pointing outward
第3题
A.Place both fists in front of your body with thumbs pointing pointing outward
B.With both arms extended out and palms down, move arms back and forth
C.Extend arm with the palm down and hold this position rigidly
D.Clasp hands in front of your body
第4题
A.Run it at minimum speed for a period of time
B.Run it at half speed for a period of time
C.Bring it to top speed immediately
D.Inject ether into the air intake
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