甘味药所含的主要活性成分是()
A.氨基酸和糖类
B.皂苷
C.挥发油
D.无机盐
E.有机酸和鞣质
参考答案:A
____ whether he ever considered ____ that during discussions, he said, "No, I've got my job and
they've got their job." [ ]
A. Asked; saying
B. Asking; saying
C. Being asked; to say
D. To be asked; to say
气相色谱法测定水和土壤中有机磷农药时,无水硫酸钠可除去萃取液中的少量残存水分。