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问题 单项选择题

为后牙铸造金属全冠做牙体预备时，错误的做法是（）

A．邻面聚合角以2°～5°为宜

B．各轴面角的线角磨圆钝

C．面磨除一般为0.5～1.0mm

D．上颌牙舌尖斜面不必多磨

E．颈部预备凹形肩台

答案

参考答案：D

解析：

铸造金属全冠做牙体预备时，一定要预备功能尖斜面，即上颌牙舌尖舌斜面以及下颌牙牙尖颊斜面，功能尖斜面的磨除要比非功能尖斜面多，与牙体长轴成45°。

选择题

已知115号元素原子有七个电子层，且最外层有5个电子，试判断115号元素在元素周期表中的位置是  [ ]

A．第七周期第IIIA族

B．第七周期第VA族

C．第五周期第VIIA族

D．第五周期第IIIA族

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Below is a discussion on a website.
http://www.TalkingPoints.com/
Stuck on a desert island?
Started on 23rd April by Steve Posts 1 - 7 of 42
Post 1
Steve
USA		Hi, everyone. What would you miss most and least if you were stuck on a
desert island? For me, it would be the changing seasons in New England. I
guess this will sound stupid but I'd probably miss the rain, too. I wouldn't
miss getting up at six every day to go to work, though! What about you?
Post 2
Tomas Germany 		Good question. Steve, I think I'd miss different types of bread, and shopping
at the supermarket. I'd miss the food most. What would I miss least? My
mobile phone---I'd like to be completely quiet --- at least for a little while
Post 3
Paola
Italy 		I would miss the company of people because I know I'd like to have
someone to share experiences with. I'd go mad on my own. And I sure
wouldn't miss junk mail (垃圾邮件) --- I hate coming home every evening
and a pile of junk mail in my post box.
Post 4
Miko
Japan 		Hi, I would miss Manga cartoon, the internet and Japanese food, like sushi.
I'd also miss TV shows and shopping for clothes… In fact, I'd miss
everything.
Post 5
Roger
UK 		I would miss my daily newspaper and listening to the news on TV and
radio. I'd feel very cut off if I didn't know what was happening in the world.
What I'd miss least would be traffic jams in the city, particularly my journey
to work.
Past 6
Jayne 		Why hasn't anyone mentioned their family? I'd be lost without my husband
and two kids. They're the most important for me. And I can't get started in
the morning without a cup of black coffee. I wouldn't miss doing the
housework!
Post 7
Jaime
Mexico 		It would have to be music. I couldn't live without my music. I wouldn't
miss going to school at all or doing homework!
1. Who would miss his or her family most?
A. Jaime
B. Jayne
C. Miko
D. Paola.
2. Which of the following people would feel most uncomfortable without the news media?
A. Steve.
B. Jaime
C. Roger.
D. Tomas
3. How many of them mentioned that they would miss food or drink?
A. One
B. Two
C. Three
D. Four
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