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{:("Element", "Use"), (A, "Radiotherapy"...

`{:("Element", "Use"), (A, "Radiotherapy"), (B, "Windows of X-ray tube"), (C, "flash produces and bulbs"), (D, "Remove air from vaccum tubes"):}`
A, B, C, D respectively are

A

Ra, Be, Mg, Ca or Ba

B

Ra, Mg, Ca or Ba, Be

C

Ra, Cr or Ba, Mg, Be

D

Ra, Mg, Be, Ca or Ba

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