下列说法正确的是（） A．PH=13的溶液中Na+、Mg2+、Cl-、NO3-

发布时间：2017-05-05 00:10 │ 来源：www.tikuol.com

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问题：

下列说法正确的是（　　）

A．PH=13的溶液中Na⁺、Mg²⁺、Cl^-、NO₃^-可以大量共存

B．PH值相等时①NH₄Cl溶液②（NH₄）₂SO₄③NH₄HSO₄三种溶液中，[NH₄⁺]大小顺序为：①=②＞③

C．等体积等浓度的氢氧化钠与醋酸混合后：[Na⁺]=[CH₃COO^-]

D．25℃时，Al（OH）₃固体在20mL 0.0lmol/L氨水中的K_sp比在20mL 0.01mol/L NH₄Cl溶液中的K_sp小

考点：离子共存粒子浓度大小的比较沉淀溶解平衡

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对成年人严重发育性或外伤性骨性牙颌面畸形，采用外科与正畸治疗联合治疗的方法进行矫治，称作（）

A.辅助性正畸治疗

B.综合性正畸治疗

C.外科与正畸治疗联合治疗

D.小范围牙移动（MTM）

E.正颌手术

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如图所示是阻值不同的两个电阻的电流随电压变化的图线，那么a、b所示的电阻及这两个电阻串联或并联后图像所在的区域正确的是：

A．a表示电阻大的图线，并联后图线在区域Ⅲ

B．a表示电阻小的图线，串联后图线在区域Ⅱ

C．a表示电阻小的图线，并联后图线在区域Ⅰ

D．a表示电阻大的图线，串联后图线在区域Ⅰ

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制订规范、标准的对外承诺( )，是实行对外承诺标准化的关键。

A．制度

B．用语

C．条款

D．文本

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第二节：下面五位老师打算寻找适合各自学生的度假去处。第61至65题是他们的学生情况介绍。阅读下面六个度假地的简介（A、B、C、D、E和F），选出符合各人需要的最佳选项，并在答题纸上将该选项标号涂黑。选项中有一项是多余选项。
62．Ms Robson’s students are studying French and German. She would like them to speak both the languages at some point while they’re away.
63．Hilary’s students are fourteen years old. Some of them learn French, so she wants to find a holiday course which can offer individual language lessons for those who would like to improve their French.
64．Rose has a small group of students. They all want to sail but unfortunately some of them are unable to swim, although they’re eager to learn.
65．Mr. Pearson’s class have just started to learn German and he wants a holiday which mixes studying the language with plenty of free time to explore the foreign country.
66．John has a class of eleven-year-olds who are crazy about sports. He’d like a course which organizes a complete program including all kinds of sports, meals and entertainments.
A B

Summer Schools in the Czech Republic
Spend a week in a sports center 15 minutes south of Prague. Each day’s program is organized by our professional trainers for children aged 10-14. Prices include breakfast, lunch and dinners as well as sightseeing tours.

Summer in France
All our courses take place at the university in Marsellie. Morning classes are held in German, evening lectures on France history are in French. We offer an exciting program of evening activities including music, dance and theatre.

C D

Summer Courses in Finland
If you love water sports you’ll love our one-week sports holiday on the Finnish lakes. There are opportunities to swim, sail and water-ski. Lessons are available if you need them. There is also a chance to learn Finnish at no extra cost! Everyone is welcome!

Greek Sailing Holidays
Arrive by air and then hire one of our new boats with all the latest equipment to sail around the Greek islands. These boats can sleep up to twenty students and two teachers. Trained sailing staff are available but you must be able to swim.

Summer Schools in France
Opportunities to speak French. We offer summer schools for students between the ages of 12 and 16. Live with a French family and choose from a range of different activities including horse-riding, indoor hockey, football, swimming and dry skiing. Private language lessons are arranged if requested.

E F

Holiday Programs in Germany
We offer morning classes in the German language at all levels from beginners upwards. In the afternoon you are free to join in our mountain walks or to go shopping in the nearby town. In the evening we organize a full program of entertainments. All ages are welcome!

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空冷器的整体结构包括（），（），（）等部分。

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下列说法正确的是（ ） A．PH=13的溶液中Na+、Mg2+、Cl-、NO3-

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下列说法正确的是（） A．PH=13的溶液中Na+、Mg2+、Cl-、NO3-