利用中药中各成分沸点的差别进行提取分离的方法是（）A.分馏法 B.回流法 C.连续回

光波在非均质体中传播时，决定光波传播速度及相应的折射率大小事光波在晶体中的（），而不是光波的传播方向。

临床试验中的随机化是为了保证（）。

A.在试验期间对干预患者和对照患者的处理与评价相似

B.研究对象能代表该试验的目标人群

C.控制观察者间变异

D.干预患者和对照患者在人口学、临床及其它特征上相似

E.试验结果能在其它情况下重复得到

句型转换

1. She used the knife to cut the fruit a moment ago. (改为被动语态)

    The knife ______ ______ to cut the fruit by her a moment ago.

2. The teacher was angry with him for being late. (改为同义句)

    The teacher was _____ with him for being late.

3. We'll have a football match after school. (改为同义句)

    We'll have a football match when school ______ ______.

4. I'm writing a letter to my aunt. (改为被动语态)

   A letter _____ ____ _____ to my aunt.

5. Hotlines are used to encourage the listeners to take part in the talk show. (改为同义句)

    Hotlines are used _____ ______ the listeners to take part in the talk show.

下列选项中，估算建设期利息应按( )计息。

A．单利

B．复利

C．平均利率

D．有效利率

慢性肾衰( )

A．B超双侧肾脏大
B．B超双侧肾脏缩小
C．B超一侧肾脏大，另一侧肾脏小
D．B超双侧肾脏增大伴多发性囊肿
E．B超双肾大小正常，一侧有一个囊肿
符合下列哪个疾病的表现