单项选择题
A.胡麻斑病B.条叶枯病C.A 和BD.没有规律
A.< 500mg/LB.1500~1000mg/LC.2000~1500mg/LD.2500~2000mg/L
A.60~100mg/LB.30~60mg/LC.15~30mgD.10~15mg