Sonar pipeline inspection system applied acoustic method to inspect the condition of liquid-filled pipe. It can provide the pipe’s condition in quantitative data which showing whether the pipe has damage or sediment (Sonar pipeline inspection system Project).
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Halloween or Hallowe'en (a contraction of Hallows' Even or Hallows' Evening), also known as Allhalloween, All Hallows' Eve,or…
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https://www.youtube.com/watch?v=XG4VAvFP-Z8&list=PLCyJUW1YwFqhfkoBsDuJEVP-ETCN-dUnp
