A.< 10,100,20,30,<10B.<10,<10,100,10,<10C.<10,120,<10,<10,10D.10,10,20,30,50
A.30CFU-300CFUB.10CFU-150CFUC.15CFU-150CFUD.10CFU-300CFU
A.≤0.5CFU/皿B.≤1CFU/皿C.≤3CFU/皿D.≤10CFU/皿