女性，46岁，左下肢乏力，右下肢麻木1年。定性诊断应考虑（） A.胶质瘤 B.脊膜瘤

已知298 K时，Mg(OH)₂的溶度积常数K_sp＝5.6×10^－12，取适量的MgCl₂溶液，加入一定量的烧碱溶液达到沉淀溶解平衡，测得pH＝13，则下列说法不正确的是(  )

A．所得溶液中的c(H^＋)＝1.0×10^－13mol·L^－1

B．所得溶液中由水电离产生的c(OH^－)＝1.0×10^－13 mol·L^－1

C．所加的烧碱溶液pH＝13

D．所得溶液中的c(Mg^2＋)＝5.6×10^－10 mol·L^－1

引起臭氧层破坏的因素有哪些？

阅读理解。

                                        China National Acrobatics (特技) Circus (杂技)

     China National Acrobatics Circus was the first State level acrobatics troupe of New China and has won

lots of gold medals in various well-known international acrobatics contests in places such as Monaco, France,

Hungary, Russia and Italy. Now the star-studded casts are exhibiting the charm and elegance of the most

professional comprehensive acrobatic art every night. Integrating superlative juggling, unicycling, balancing

and jumping through hoops with the finest ancient Chinese dancing, the award-winning variety show will

amaze you at every turn.

     Time / Date: 19:15-20:30, every evening

      Location: Universe Theatre, 10 Dongzhimen Nandajie, Dongcheng District (100 meters north of Poly

Plaza) 

      Tel: 65023984, 65022649, 64169893 

      Fax: 65002743

                                                                 Kung Fu Show

     The 70-minutes performance displays dazzling skills of mysterious Chinese kung fu in a hero-plus-beauty

story. Fifty kung fu masters amaze the audience with barehanded practice, one-to-one competing and weapons

practice.

      Presented by Beijing Detain Shunyi Culture Development Co. Ltd.

      Place: Xin Rong Theatre (Xuan wu District)

     Time / Date: 19:30, nightly

     Tel: 83540774, 83540775 

                                                                    Concerts

      Light tunes: The Light Music Troupe of the China National Song and Dance Ensemble is to stage a

concert. Programmes include the Japanese work "The Spring of the Northern Nation", Strauss "The Blue

Danube Waltz", as well as songs by vocal soloists, "The Same Song"," Beautiful Spanish Maidens", "Memories"

and others.

     Time: 2:30 pm, April 6

      Place: Concert Hall of China National library, Zhongguancun Nandajie

      Tel: 88545731 

                                                                   Exhibition 

      Art Show: The Wangfung Art Gallery is hosting a joint art exhibition featuring about 50 realistic watercolor works by artists Jiang Chun form Suzhou in Jiangsu Province, Huang Youwei from Beijing and Yu Jiantao

form Dalian, Liaoning Province. The exhibition runs until April 8.

     The three artists have tried in different ways to combine the concepts and techniques of traditional Chinese

paintings and those of watercolors.

     Time: 9 am-5 pm until April 8

     Place: 136 Nanchizi Dajie, Dongcheng District

     Tel: 65233320

1. You are likely to have a good morning if you go to the _____. [ ]

A. Universe Theatre

B. Concert Hall of China National Library

C. Xin Rong Theatre

D. Wangfung Art Gallery

2. If you like foreign culture, you can _____. [ ]

A. go to the art show

B. go to the concert

C. see the film

D. see acrobatics show

3. Which of the following is NOT true? [ ]

A. Some programs of Acrobatics Circus are first-class in the world.

B. The art exhibition will last until the eighth of April.

C. You can enjoy Chinese kung fu at the Universe Theater.

D. "The Spring of the Northern Nation" belongs to light music.

小红学过“机械效率”的知识后，产生了一个疑问：“机械的机械效率越高是否越省力？”针对这个问题，小红向老师借来了一只弹簧测力计，利用家中的“案板（切菜用）”和茶杯做了如下的探究：

（1）把杯子放在塑料袋中，向杯子中加入适量的水，用弹簧测力计测得杯子和水的总重力为G；

（2）用“案板”做斜面，如图所示，把一只水杯通过细绳与弹簧测力计连接，拉动弹簧测力计，使水杯沿斜面匀速移动到斜面顶端；

（3）分别测出拉力F，杯子移动的距离s和杯子升高的高度h；

（4）改变斜面的高度，做4次实验，记录实验数据如下表：

次数 物理量	1	2	3	4
重力G/N	5	5	5	5
升高h/m	0.1	0.15	0.2	0.25
有用功W有/J		0.75	1	1.25
拉力F/N	1.6	2.2	2.7	3.1
移动距离s/m	0.5	0.5	0.5	0.5
总功W总/J		1.1	1.35	1.55
机械效率η		0.68		0.81

Ⅰ．请计算并将数据填入表格中的4个空格

Ⅱ．小红的疑问是否得到解决？分析实验数据，能得到什么结论？

Ⅲ．完成上面的实验后，小红又产生了一个猜想：“如果减小斜面的摩擦，可以提高斜面的机械效率．”那么：

1．请你用学过的知识说明小红的猜想是否正确（简述理由）

2．你设计一个实验，进一步证明你对小红的猜想所作出的判断．

各级运维部门应及时组织相关人员按时完成网络调度和测试任务、及时（），并做相应的归档工作。

A.派单

B.接单

C.回单

D.实施