同时，这一方法可避免覆盖层生长太厚的开裂问题，结合侧向外延生长可以大大提高外延片的利用率。

At the same time, the method can avoid a craze problem caused by a thick covering layer, and increase extension plate utilization greatly combined with side extension growth.

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方法采用细胞毒性试验中的琼脂覆盖法，通过直接放置样品和放置样品浸提液载片两种方法，对三批不同生产日期的奥美定进行测试研究。

Methods Using NCTC 929 clone and agar diffusion method, the three products of different producing dates were evaluated by both methods of laying specimens directly and only laying its extraction.

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