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Author Question: By what percent should backwash water expand a sand filter bed? a. 0-10 b. 10 -20 c. 20 -30 d. ... (Read 20 times)

jeatrice

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on: Jul 26, 2018
By what percent should backwash water expand a sand filter bed?
 
  a. 0-10
  b. 10 -20
  c. 20 -30
  d. 30 -40
  e. 40 -SO

Question 2

The shut-off of two pumps A in parallel is:
 
  a. 1
  b. 2
  c. 3
  d. 4
  e. 5


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Sophiapenny

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Reply #1 on: Jul 26, 2018
Answer to Question 1

d

Answer to Question 2

b


jeatrice

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Reply 2 on: Jul 26, 2018
Gracias!

jomama

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Reply 3 on: Yesterday
Excellent

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