PCDA(Demingcycle)isaniterativefour－stepmanagementmethodusedincontinualimprovementofprocessesandproducts.Duringthe()phase，thedataandresultsgatheredfromthedophaseareevaluated.Dataiscomparedtotheexpectedoutcomestoseeanysimilaritiesanddifferences.
A.plan
B.do
C.check
D.act
正确答案是C