高聚物改性沥青防水卷材的搭接宽度是多少

山东省质量技术监督局与吉林省质量技术监督局在长春签署了《质量合作协议书》，联手拆除“篱笆墙”，两省表示：坚决“反对地方保护主义，不搞地区封锁，为两省名牌产品进入当地市场创造一切方便条件”。 地方保护主义、地区封锁的存在表明（　　）

A．市场调节具有自发性的弊端

B．市场调节具有盲目性的弊端

C．市场调节具有滞后性的弊端

D．市场经济是实现资源优化配置的有效形式

血清电泳时，Ig主要分布于（）

A.α₁区

B.α₂区

C.β区

D.γ区

E.α区

阅读理解

     I arrived at my mother's home for our Monday family dinner. The smells of food flew over from the

kitchen. Mother was pulling out quilt after quilt from the boxes,proudly showing me their beauties.She

was preparing for a quilt show at the Elmhurst Church. When we began to fold and put them back into

the boxes,l noticed something at the bottom of one box. I pulled it out. " What is this?"I asked.

      " Oh? " Mom  said , " That's  Mama's  quilt. "

      I spread the quilt. It looked as if a group of school children had pieced  it  together:irregular designs ,

childish  pictures , a crooked line on the right.

      "Grandmother made this?" I  said, surprised. My grandmother was a master at making quilts. This

certainly didn ' t look like any of the quilts she had made.

      " Yes , right before she died,l brought it home with me last year and made some changes, "she said. "I'm still working on it. See, this is what I' ve done so far. "

       I looked at it more closely. She had made straight a crooked line. At the center of the quilt, she had

stitched(缝) a piece of cloth with these words : "My mother made many quilts. She didn't get all lines

straight. But l think this is beautiful. I want to see it finished. Her last quilt. "

       " Oh, this is so nice, Mom, " I said. It occurred to me that by completing my grandmother' s quilt,

my mother was honoring her own mother. I realized. too, that I held in my hands a family

treasure. It started with the loving hands of one woman, and continued with the loving hands of another.

1. Why did the author go to her mother's home?_________ 

A. To see her mother's quilts.

B. To help prepare for a show.

C. To get together for the family dinner.

D. To discuss her grandmother's life.

2. The author was surprised because__________. 

A. the quilt looked very strange

B. her grandmother liked the quilt

C. the quilt was the best she had seen

D. her mother had made some changes

3. The underlined word "crooked"  in the passage most probably means__________. 

A. unfinished                      

B. broken

C. bent                            

D. unusual

4. Which of the following would be the best title for the passage?_________ 

A. A Quilt Show                  

B. Mother's Home

C. A Monday Dinner            

D. Grandmother's Quilt

向50mLNa₂SO₄和Na₂CO₃的混合溶液中加入过量BaCl₂溶液，得到14.51g白色沉淀，向白色沉淀中再加入过量稀HCl，充分反应后沉淀减少到4.66g，并有气体产生。

⑴ 求原混合物溶液中Na₂SO₄和Na₂CO₃的物质的量。

⑵ 求产生的气体在标准状况下的体积。　

综合性仲裁机构