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核酸(Nucleic acid)
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单选题A container holds 8 pints of a solution which is 25% acid. If 2 quarts of pure acid are added to the container, what percent of the resulting mixture is acid? (1 quart=2 pints)A
50B
20C
40D
45E
35
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单选题The electrolyte in a lead-acid storage battery consists of distilled water and ().A
hydrogen chlorideB
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muriatic acid
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boric acid solutionB
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