An electronic stopping cross section formula for heavy ions at low yelocity is obtained within the uniform free electron gass model and perturbation limit.

在均匀电子气模型和微扰极限成立的条件下，给出了低迷离子在固体中的电子阻止截面公式。

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Now, a relatively complete manufacturing system of electronics has been established to provide large amounts of electronic installations and a cross-section of electronic products.

建立了比较完整的电子工业生产体系，提供了大量电子装备和各类电子产品。

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