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A.總蟲(chóng)數(shù)/陽(yáng)性房間數(shù)
B.總蟲(chóng)數(shù)/陽(yáng)性房間數(shù)×100%
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A.查房間總數(shù)/陽(yáng)性房間數(shù)×100%
B.陽(yáng)性房間數(shù)/查房間總數(shù)×100%
C.陽(yáng)性房間數(shù)/查房間總數(shù)
D.查房間總數(shù)/陽(yáng)性房間數(shù)