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madisoncole0416 madisoncole0416
wrote...
Posts: 832
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6 years ago
Which foam proportioner consists of two positive-displacement rotary-gear pumps mounted on a common shaft?
 
  A. Around-the-pump proportioner
  B. Balanced pressure proportioner
  C. Pressure proportioning tank system
  D. Coupled water motor-pump proportioner
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wrote...
6 years ago
D
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