The invention discloses a small particle size narrow distribution penicillin acylation enzyme fixed carrier preparation method.

本发明公开了一种小粒径窄分布青霉素酰化酶固定化载体的制备方法。

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The invention relates to a strengthened polyethylene imine fixed carrier composite membrane for separating acid gas and a preparation method thereof.

本发明涉及一种用于分离酸性气体的强化聚乙烯胺固定载体复合膜及其制备方法。

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This essay tries to establish a definition for small ads and identify their most important features as distinguished from other types of ads, namely, small ads have no fixed carrier.

本文给出了“城市小广告”的明确概念，首次明确了“城市小广告”区别于其他类型广告的最重要特点是“无专门固定载体”。

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Telmex is still the dominant fixed-line phone carrier in Mexico, two decades after Slim took it private.

FORBES: Carlos Slim's Telmex May Be Heading Into Pay TV Competition

Verizon, a local fixed-line and cellular carrier that serves both Washington and New York, among other cities, said calls to the area doubled from their normal peak volumes of 115 million in New York and 35 million in Washington in the wake of the incidents.

CNN: Networks hit, but telecom stays operational