The chemical used as a fixer in photography is__________?

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Which gas is commonly used in ballons and airship a Helium [B] Hydrogen c Carbon d NOT

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What charge card, developed in 1950, was the first to be accepted nationally in the US?

A. Visa B. Discover C. MasterCharge D. Diner’s Club...

Sound travels in air at an average speed of nearly________ ?

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spinal card controlls all

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Myopia is a human eye disorder That can be corrected by using the lense ?

A: Convex B: Concave C: Cylindrical D: Medicine...