Engine : Refrigeration AC - 159/610
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| The gas that exists in the stratosphere forming a protective shield that helps to protect the environment from the harmful effects ultraviolet radiation is called what? |
| A) radon |
| B) ozone |
| C) oxygen |
| D) nitrogen |
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| captainpirate - 2017-09-28 23:15:40 Registered (3) |
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