Answer: 3) "dm" ("decimeter /s") .
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Note:
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Answer choice: 1) "ml" ; or, "mL" ; or, "milliliters"; is a unit for volume.
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Answer choice: 2) "cg" ; or "centigram /s"); is a unit for mass.
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Answer choice: 3) "gal" ; or "gallon/s" ; is a unit for volume.
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