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[" 8.Under what condition does a straigh...

[" 8.Under what condition does a straight line "],[(x-x_(0))/(l)=(y-y_(0))/(m)=(z-z_(0))/(n)" is parallel to the "xy" -plane? "],[[" (A) "l=0," (B) "m=0],[" (C) "n=0," (D) "l=0,m=0]]

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