铸造时石膏类包埋材料的加热温度必须在() A.500℃以下 B.600℃以下 C.7

题型:单项选择题 A1型题

问题:

铸造时石膏类包埋材料的加热温度必须在()

A.500℃以下

B.600℃以下

C.700℃以下

D.1000℃以下

E.1100℃以下

考点:口腔医学技术(士)口腔医学技术士基础知识口腔医学技术士基础知识题库
题型:单项选择题 A1型题

阅读理解。

      Once upon a time, there lived a rich man. He had a servant (仆人). He and the servant loved wine

(酒) and good food very much. Each time the rich man left his home, the servant would drink the wine

and eat up(吃光)all the nice food in the house. The rich man knew what his servant did , but he had

never caught (抓住) his servant doing that.

     One morning, when he left home, he said to the servant, "Here are two bottles of poison (毒药) and

some nice food in the house. You must take care of (看管好) them." With these words, he went out.

     But the servant knew that the rich man had said was untrue (假的), after the rich man was away

from his home, he enjoyed a nice meal. Because he drank too much, he was drunk (喝醉酒) and fell

to the ground. When the rich man came back, he couldn't find his food and his wine. He became very

angry. He woke (叫醒) the servant up. But the servant told his story very well. He said a cat had eaten

up everything. He was afraid (害怕) to be punished (被惩罚), so he drank the poison to kill (杀死)

himself.

1. In the story, _______ liked wine and good food very much.

A. the rich man  

B. the servant    

C. both A and B    

D. nobody

2. The rich man told the servant that there was poison in the two bottles, because _______.

A. there was in fact poison in the bottles

B. he did not want the servant to drink his wine

C. he wanted to kill the cat

D. he wanted to kill the servant

3. In fact (实际上), _______ ate all the nice food and drank the wine. 

A. the servant    

B. cat        

C. the rich man      

D. nobody

4. From the story, we know that the servant is very _______.

A. lazy (懒惰的)    

B. stupid (蠢的)      

C. clever (聪明的)  

D. kind

题型:单项选择题 A1型题

在我们学过的图形中,有四条对称轴的是______形,等腰三角形有______条对称轴.

题型:单项选择题 A1型题

我国民族的分布特点是

A.集中分布

B.分散分布

C.大散居、小聚居、交错杂居

D.少数民族分布区没有汉人居住

题型:单项选择题 A1型题

其元素符号为X,则有6个中子、7个质子的原子核,可表示为()。

A.67X

B.613X

C.136X

D.713X

E.76X

题型:单项选择题 A1型题

由于铝股线直径越小,强度越高,而铝线股数越多,强度损失系数越大,故铝绞线计算拉断力与股数和股径有关。

铝绞线LJ-95(结构7/4.16)σa=160N/mm2,其抗拉强度为( )。

A.13540N;
B.14000N;
C.14459N;
D.15100N。

更多题库