问题 多项选择题

以下哪些药物含量测定所用的溶剂为冰醋酸()

A.硝酸士的宁

B.黄连素

C.奋乃静

D.苯巴比妥

E.阿司匹林

答案

参考答案:A, C

解析:士的宁有弱碱性,原《中国药典》(2005版)采用非水溶液滴定法测定硝酸士的宁含量。漓定产物硝酸在冰醋酸介质中虽为弱酸,但它具有氧化性,可以破坏指示剂,故采用电位法指示终点。硝酸士的宁的含量测定方法如下:取本品约0.39,精密称定,加冰醋酸20ml,振摇使溶解,用高氯酸滴定液(0.1mol/L)滴定,以电位法(玻璃-饱和甘汞电极系统)指示终点。奋乃静侧链哌嗪环上的氮原子有碱性,《中国药典》(2010版)采用非水溶液滴定法测定其含量,方法为:取本品约0.15g,精密称定,加冰醋酸20ml溶解后,加结晶紫指示液1滴,用高氯酸滴定液(0.1mol/L)滴定,至溶液显蓝绿色,并将滴定的结果用空白试验校正。

填空题
阅读理解

Have you ever wondered about people’s names? Where do they come from? What do they mean?

Some people give their children names that mean good things. Clara means “bright”; Beatrice means “one who gives happiness”; Donald means “world ruler”; Leonard means “as brave as a lion”.

The earliest last names, or surnames, were taken from place names. A family with the name Brook or Brooks probably lived near brook(小溪);Someone who was called Longstreet probably lived on a long, paved road. The Greenwood family lived in or near a leafy forest.

Other early surnames came from people’s occupations. The most common occupational name is Smith, which means a person who makes things with iron or other metals. In the past, smiths were very important workers in every town and village. Some other occupational names are: Carter — a person who owned or drove a cart; Potter —a person who made pots and pans.

The ancestors(祖先) of the Baker family probably baked bread for their neighbors in their native village. The Carpenter’s great-great-great-grandfather probably built houses and furniture.

Sometimes people were known for the color of their hair or skin, or their size, or their special abilities. When there were two men who were named John in the same village, the John with the gray hair probably became John Gray. Or the John was very tall could call himself John Tallman. John Fish was probably an excellent swimmer and John Lightfoot was probably a fast runner or a good dancer.

Some family names were made by adding something to the father’s name. English-speaking people added –s or –son. The Johnsons are descendants of John; the Roberts family’s ancestor was Robert. Irish and Scottish people added Mac or Mc or O. Perhaps all of the MacDonnells and the McDonnells and the O’Donnells are descendants of the same Donnell.

小题1:Which of the following aspects do the surnames in the passage NOT cover?

A.Places where people lived.

B.People’s occupations.

C.Talents that people possessed.

D.People’s characters.小题2:According to the passage, the ancestors of the Potter family most probably _______.

A.owned or drove a cart

B.made things with metals

C.built houses and furniture

D.made kitchen tools or contains小题3:Suppose an English couple whose ancestors lived near a leafy forest wanted their new-born son to become a world leader, the baby might be named _______.

A.Donald Greenwood

B.Leonard Carter

C.George Longstreet

D.Beatrice Smith小题4:The underlined word “descendants” in the last paragraph means a person’s _______.

A.later sponsors

B.later generations

C.friends and relatives

D.colleagues and partners