问题：
[单选题]消毒技术规范中，医疗器械用下排气式压力蒸汽灭菌器灭菌，为达灭菌效果，一般需要维持的温度和时间分别是（ ）。
A、115℃，15～30min
B、121℃，10～15min
C、121℃，20～30min
D、115℃，20～30min
E、以上均非
参考答案：
C
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