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Calcium bromide is the name for compounds with the chemical formula CaBr2(H2O)x.
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what I don't know show a question mark me as brainleast
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A system of two co-axial cylindersof different diameters which rotate together is called wheel and axle example; the door knob , knob of the tap ,screw driver,water tap
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Concave lenses are used in eyeglasses that correct myopia or nearsightedness.
Hmm, I got that the wavelength is 500 meters.