[衛(wèi)生法規(guī)]上皮層中層次最多 細(xì)胞為多邊形的細(xì)胞是

原題:
[衛(wèi)生法規(guī)]上皮層中層次最多，細(xì)胞為多邊形的細(xì)胞是

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A.mean
B.variance
C.percentile
D.standard deviation
E.coefficient of variation