...样品中的目的菌（特别是处于劣势时）得以良好的生长，从而得到富集，并可将非目的菌淘汰掉。 2.鉴别性培养基(differential media)：用于鉴别不同类型的微生物的培养基。
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selective and differential media 选择和指示性培养基
It is proved that if the medium is piecewisely homogeneous, the solution of the differential -integral equation satisfies the boundary conditions on boundaries between different media.
证明了在介质为分区均匀的条件下，这个微分-积分方程的解满足不同介质边界面的边界条件。
When a differential pressure water - level gauge is used to measure the water - level in the vessel, large uncertainty can be induced because of the change of media density in the vessel.
在高温高压容器中采用差压式水位计测量水位的方法，通常由于容器中介质密度的变化给测量带来很大误差。
On the assumption that the media is an ideal fluid, the analytic solution for differential equations of disturbing flow is obtained.
在理想气体假设下给出了扰动流运动微分方程组的解析解；
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