搜题请搜索小程序“爱下问搜题”
问题 单项选择题

在配制静脉输液时，不宜直接或间接用氯化钠注射液溶解的药品是（）。

A.盐酸林可霉素

B.盐酸万古霉素

C.硫酸庆大霉素

D.苯妥英钠

E.两性霉素B

答案

参考答案：E

解析：本组题考查要点是“药物的适宜溶剂”。苯妥英钠属于弱酸强碱盐，与酸性的葡萄糖液配伍可析出苯妥英沉淀；两性霉素B应用氯化钠注射液溶解可析出沉淀。

单项选择题

To many environmentalists, the extinction of plants—accompanied by the increasing genetic uniformity of species of food crops—is the single most serious environmental problem. Something must be done to prevent the loss of wild food plants or no-longer-cultivated food plants. Otherwise, the lack of genetic diversity could allow a significant portion of a major crop to be destroyed overnight. In 1970, for example, southern leaf blight destroyed approximately 20 percent of the United States corn crop, leaving very few varieties of corn unaffected in the areas over which the disease had spread. Which of the following can be inferred from the passage above

A．Susceptibility to certain plant diseases is genetically determined.

B．Eighty percent of the corn grown in the United States is resistant to southern leaf blight.

C．The extinction of wild food plants can in almost every case be traced to destructive plant diseases.

D．Plant breeders focus on developing plants that are resistant to plant disease.

E．(E) Corn is the only food crop threatened by southern leaf blight.
查看答案
单项选择题 A1/A2型题

脂蛋白电泳时，可向阴极侧泳动的脂蛋白是 （）

A.CM

B.VLDL

C.LDL

D.LP-X

E.HDL
查看答案