单项选择题
A.1pg/mlB.1ng/mlC.1ug/mlD.1mg/ml
A.10-6~10-4g/mlB.10-8~10-4g/mlC.10-12~10-10g/mlD.10-16~10-10g/ml
A.大气压离子化接口B.直接液体导入接口C.动态快原子轰击接口D.粒子束接口