肾上腺素中酮体的检查:取本品0.20g,置100ml量瓶中,加盐酸溶液溶解并稀释至刻度,摇匀,在310nm处测定吸光度不得超过0.05。已知酮体的百分吸光系数为435,求酮体的限量()
A. 5%
B. 0.06%
C. 0.6%
D. 0.03%
Which of the following things is not a digital product?
A. computer
B. mobile phone
C. handbag
D. digital camera
取药品0.20g,精密称定,用25ml甲溶解,后进行水分测定,消耗费休氏试液15.03ml,空白试验消耗费休氏试液1.53ml,费休氏试液的F=3.98mg/ml。求药品中的水分含量()
A. 1.5%
B. 26.9%
C. 13%
D. 0.06%
How often do you use WeChat ?
A. three days
B. every day
C. a week
D. a month