The abbreviation for a soft, very heavy metal used for shielding against x-rays is:
A) R.
B) Ba.
C) Ra.
D) Pb.
D
Explanation: A) The abbreviation R stands for roentgen.
B) Ba stands for barium.
C) Ra stands for radium.
D) Correct.
Health & Biomechanics
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Fill in the blank(s) with correct word
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