患者因左上侧切牙冠折，要求做烤瓷修复在金属底层冠的表面处理中_爱下问搜题

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问题单项选择题

患者因左上侧切牙冠折，要求做烤瓷修复

在金属底层冠的表面处理中，宜采用

A．磷酸处理

B．硫酸处理

C．盐酸处理

D．氢氟酸处理

E．硝酸处理

答案

参考答案：D

解析：表面处理首先是彻底清洁，去除附着软垢或菌斑等，其次可用喷砂法或砂石进行粗化处理，亦可在暴露的金属表面磨出沟、倒凹等固位形。其中喷砂效果最好，粗化后再用5%～10%氢氟酸，用清水洗净，气枪吹风。

完形填空

完形填空。

Everyone in our school loves sports. Evrey morning _1_ we get up, we do morning exercises.After the second class we do exercises again.We only have__2_ classes twice a week,but we do physical training at five every afternoon.The most popular sport is basketball. The __3__ enjoy playing it and many of the girls like it,too. _4_ popular sport is football and in every class there._5_ a lot of football fans.Volleyball is often played when the weather is _6_. We have school
Teams in basketball,football and volleyball. Our teams often __7__ friendship matches with teams from other schools.When there

is a match, _8__ of us go to watch it and cheer our side on. Besides ball games,
some of us like track and field events,_9__ we often practise running,jumping and throwing.Every term we
have tests in these events and once a year we hold a sports meeting.Sports help us to keep _10_.

( ) 1. A.  while
( ) 2. A.  English
( ) 3. A.  teacher
( ) 4. A.  Some other
( ) 5. A.  are
( ) 6. A.  shining
( ) 7. A   see
( ) 8. A.  Several
( ) 9. A.  becausa
( ) 10.A.  thirsty and hungry

B.  when
B.  Chinese
B.  boys
B.  Other
B.  is
B.  rainy
B.  have
B.  few
B.   but
B. healthy and happy

C.  before
C.  PE.
C.  students
C.  Another
C.  were
C.  fine
C . look at
C. a few
C.  or
C. fat and tired

D .  after
D.  music
D.  people
D.  The other
D.  was
D.  wet
D.  Watch
D.  many
D.  and
D. thin and weak

填空题

公元（）年苏轼因乌台诗案获罪入狱。