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单选题
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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单选题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 outB
Place both fists in front of the body with the thumbs pointing upwardC
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Extend arm with the thumb pointing up，and flex the fingers in and out for as long as the load movement is desiredC
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单选题How should you signal the crane operator to swing?（）.A
With both arms extended out and palms to down, move arms back and forthB
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单选题How should you signal the crane operator to lower the boom and raise the load（）.A
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Extend arm with the palm down and hold this position rigidlyB
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Place both fists in front of the body with the thumbs pointing outwardB
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Extend arm with the palm down and and hold this position rigidlyD
Clasp hands in front of you body
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