A breath test used by traffic police to check drunken driving uses ____?

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Question:A breath test used by traffic police to check drunken driving uses ____?

1. Turmeric on filter paper

2.Silica gel coated with silver nitrate

3.potassium permanganate-sulphuric acid

4.Potassium dichromatic-sulphuric acid

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  1. A breath test used by traffic police to check drunken driving uses ____?
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