an inapparent infection
显感染
an inapparent infection
显感染
Its ratio of inapparent infection to apparent infection is about 100:1.
该病隐性感染与显性感染比例约为100:1。
when the wind speed and windward are steady , the concentration value of dimensional spot change along with time is inapparent, it may be considered steady.
在稳定风流下,空各点气体浓度值随时变化显,其浓度场是稳态。
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