单项选择题
What is the primary purpose of a splint applied in first aid?（）
A.Control bleeding
B.Reduce pain
C.Immobilize a fracture
D.Reset the bone
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A.An amount equal to the depth of the water
B.Two times the depth of water
C.Three to four times the depth of water
D.Five to seven times the depth of water -
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A.Carbon disulfide
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