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l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