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【单选题】
关于制备牛肉膏蛋白胨固体培养基,叙述错误的是( )
A.
操作顺序为计算、称量、熔化、倒平板、灭菌
B.
将称好的牛肉膏连同称量纸一同放入烧杯
C.
待培养基冷却至50℃左右倒平板
D.
待平板冷却凝固约5~10min后将平板倒过来放置
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