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【简答题】
奥沙西原料药含量测定 精密称定 0.0150g ,置 200ml 容量瓶中,加乙醇 150ml ,于温水浴中加热,振摇使奥沙西溶解,放冷,用乙醇稀释至刻度,摇匀,精密量取 5ml ,置 100ml 容量瓶中,用乙醇稀释至刻度,摇匀,在 229nm 的波长处测定吸光度为 0.482 ;另精密称取奥沙西对照适量,配制成浓度为3.725μg/ml的对照品溶液,在 229nm 的波长处测定吸光度为 0.463 ;药典规定本品按干燥品计算,含 C 15 H 11 CIN 2 O 2 98.0%~102.0% 。该供试品含量是 多少 ?
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反馈参考答案：
举一反三
【单选题】_____ man may usually be known by the books he reads as well as by ______ company he keeps.
A.
The; a
B.
A; a
C.
The; the
D.
A; the
【单选题】Everyone can borrow this dictionary ______he keeps it clean otherwise he will have to pay for the damage.
A.
so that
B.
as far as
C.
as long as
D.
as soon as
【单选题】Chan keeps the money made from business for himself.
A.
Right
B.
Wrong
C.
Doesn't say
【简答题】He keeps looking at himself in the mirror.
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