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【单选题】
共价键、离子键、分子间作用力等都是构成物质微粒间的不同作用，含有以上所说的两种作用的物质是（ ）A.
氦
B.
石英
C.
烧碱
D.
食盐
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【单选题】精密称取适量(约相当于对乙酰氨基酚40mg)
A.
精密称取对乙酰氨基酚36mg
B.
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C.
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D.
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A.
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B.
错误
【简答题】《中国药典》中测定对乙酰氨基酚原料药方法为：取本品40mg，精密称定，置于250mL量瓶中，加0.4%氢氧化钠溶液50mL，溶解后加水至刻度，摇匀；精密量取5mL，置于100mL量瓶中，加0.4%氢氧化钠溶液10mL，加水至刻度，在257nm的波长处测定其吸收度为0.520。已知对乙酰氨基酚的吸收系数为715，计算供试品的百分含量。
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