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А жұлдызы

Star with spectral type A in which the spectrum of the Balmer lines of hydrogen attain their greatest strength. Helium lines can no longer be seen. Some metallic lines are present; in late A stars the H and K lines of ionized calcium appear. A0 stars have a color index of zero.

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Valdkond/domeen: Anatomy Category: Human body

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The portion of the brain in the back of the head between the cerebrum and the brain stem.

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