藻酸盐印膜材料与胶结剂的反应极为迅速,需加入缓凝剂延缓反应进行。常用的缓凝剂不包括(

题型:单项选择题 A1/A2型题

问题:

藻酸盐印膜材料与胶结剂的反应极为迅速,需加入缓凝剂延缓反应进行。常用的缓凝剂不包括()。

A.碳酸钠

B.磷酸钠

C.草酸盐

D.磷酸三钠

E.氧化锌

考点:口腔正畸主治医师口腔材料学口腔材料学题库
题型:单项选择题 A1/A2型题
完成单词。
1. l__ke  v. 
2. h__mb__g__ n.
3. t__m__t__  n.
4. __ r__nge  n.
5. str__b__ry  n.
6. s__l__d  n.
7. p__  n.     
8. h__ve v.   
9. f__d  n.    
喜欢 
汉堡包
西红柿
橙子 
草莓 
沙拉 
梨                                   
吃;饮
食物                                                    
题型:单项选择题 A1/A2型题

阅读理解。

     Excuse me, Mrs. Jones .Would you mind doing me a favor ? I was just going out shopping. But as

soon as I shut my front door, I realized that I had left my key in the house. So when I get back, I will not

be able to get in .It was very silly of me. I needn't have come out at all, because all the vegetables and

fruits had been bought by my husband. I only wanted some salt. May I come in and clime over the fence

into my back garden? That's very kind of you. I wish I did not give you so much trouble.

1. Mrs. Jones was the speaker's_____.

A. boss  

B. next-door neighbour    

C. friend    

D. sister

2. This speech was made_____.

A. before the speaker went out shopping

B. when the speaker went back after shopping

C. while she was shutting the front door

D. after her husband returned from the office

3. Mrs. Jones _____.

A. refused to help her          

B. agreed to let her in

C. gave her some salt          

D. telephoned her husband

题型:单项选择题 A1/A2型题

蜗杆的零件图采用一个主视图和(  )的表达方法。

A.旋转剖视图

B.局部齿形放大

C.移出剖面图

D.俯视图

题型:单项选择题 A1/A2型题

不得对我们获得必要生活物资的行为加以限制,而且如果我们通过个人的力量无法为计时,政府或他人必须为我们提供必要的生活物资属()。

A.积极权利

B.消极权利

C.厌恶权利

题型:单项选择题 A1/A2型题

《安全生产法》规定,矿山建设项目和用于生产、储存危险物品的建设项目的施工单位必须按照批准的()设计施工,并对其工程质量负责。

A.生产设备

B.安全设施

C.主体工程

D.项目图纸

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