单项选择题

A.静态≤1cfu/30min/皿,动态≤5cfu/30min/皿
B.静态≤1cfu/30min/皿,动态≤1cfu/30min/皿
C.静态≤5cfu/30min/皿,动态≤1cfu/30min/皿
D.静态≤5cfu/30min/皿,动态≤5cfu/30min/皿