181285
If we have : Then : Where : If T = period of a complete alternation ( one revolution of the crank ) then : The effective current can be defined by the equation : The stoke volume δ will be given by the relation : Alternating pressures The alternating pressures are very similar with alternating currents in electricity .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
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