罗马法上的婚姻有两种：一种是有夫权婚姻，另一种是无夫权婚姻，二者各有差异。以下关于有

某患者的基牙颈部有倒凹，制作代型时用大石膏填补，其结果是（）

A.冠边缘过长

B.冠边缘不密合

C.冠翘动

D.冠咬合高

E.冠邻接关系不良

  同义句转换。

1. Here you can find out more about these world-famous  musicians.  

    Here you can find out more about these musicians _____ are _____ in the world.

2. Liverpool is very important because its industry and  trade played an important role in the 18th century.  

    Liverpool is very important _____ _____ its industry and trade in the 18th century.

3. They sleep outdoors in tents and listen to the music.  

    They sleep _____ _____ _____ _____ and listen  to the music.

4. Tourists can take a bus tour to visit some of the places  the Beatles mentioned in their songs.  

    Tourists can take a bus tour to visit some of the places _____ the Beatles _____ in their songs.

5. Open-air rock concerts are liked by many people.   

    Open-air rock concerts are_____ _____.

二极管加正向电压时一定导通。（）

颅骨不分内外板和板障的年龄是（）

A.6岁以前

B.7岁以前

C.8岁以前

D.9岁以前

E.10岁以前

一发热的上呼吸道感染的患儿，室内的湿度应保持在（）

A.20%～30%

B.30%～40%

C.40%～50%

D.50%～60%

E.60%～70%