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ccanez ccanez
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6 years ago
Most systems use a flap door that swings about ________ degrees
A) 10 to 25      B) 25 to 40      C) 45 to 90      D) 90 to 120
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Afro86Afro86
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6 years ago
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ccanez Author
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#2
6 years ago
God bless you! Helped my grade so much.
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