结果表明：冷冻干燥法保藏菌种时间最长（本实验室已保存15年）； 肉浸汤琼脂平板法保藏菌种时间最短（2～3月）。
The results indicated: freeze-drying method could do the longest preservation (at least 15 years) while beef broth agar plate method did the shortest (only 2 to 3 months).
平板计数法比较冷冻干前后的活菌数，计算存活率。
The number of viable cells was compared with the plate count before and after lyophilization to calculate the survival rate.
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