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
参考答案:C
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
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