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问题 单项选择题

桩冠长度至少应为根长的

A．1/3～1/2

B．1/2～2/3

C．2/3～3/4

D．1/3

E．1/2

答案

参考答案：C

单项选择题

An 20-month-old with acquired immunodeficiency syndrome (AIDS) is seen in the clinic for health maintenance. Which of the following vaccines would the nurse anticipate administering to this toddler

A. Diphtheria-tetanus-acellular pertussis.
B. Varicella.
C. Measles, mumps, and rubella.
D. Hemophilus influenz
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单项选择题

食用高胆固醇，高脂肪饲料后易形成动脉粥样硬化与高脂血症模型的动物是（）。

A.小鼠

B.大鼠

C.豚鼠

D.兔
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