单项选择题

A.清洁中段尿培养,菌落计数为<1000个/ml
B.清洁中段尿培养,菌落计数为1000个/ml
C.清洁中段尿培养,菌落计数为1万个/ml
D.清洁中段尿培养,菌落计数为5万个/ml
E.清洁中段尿培养,菌落计数为10万个/ml