各接地装置的接地电阻如何要求？

阅读理解。

     Last week my youngest son and I visited my father at his new home in Tucson, Arizona. He moved there

a few years ago, and I was eager to see his new place and meet his friends.

     My earliest memories of my father are of a tall, handsome, successful man devoted to his work and family

but uncomfortable with his children. As a child I loved him; as a school girl and young adult,I feared him and

felt bitter about him. He seemed unhappy with me unless I got straight As and unhappy with my boyfriends if

their fathers were not as "successful" as he was. Whenever I went out with him on weekends, I used to

struggle to think up things to say, feeling on guard.

     On the first day of my visit, we went out with one of my father's friends for lunch at an outdoor cafe. We

walked along that afternoon, did some shopping, ate on the street table, and laughed over my son's funny facial

expressions. Gone was my father's critical (挑剔的) air and strict rules. Who was this person I knew as my

father, who seemed so friendly and interesting to be around? What had held him back before?

     The next day my dad pulled out his childhood pictures and told me quite a few stories about his own

childhood. Although our times together became easier over the years, I never felt closer to him at that moment. After so many years, I'm at last seeing another side of my father. And in so doing, I'm delighted with my new

friend. My dad in his new home in Arizona is back to me from where he was.

1. Why did the author feel bitter about her father as a young adult?

A. He did not love his children.

B. He was too proud of himself.

C. He was silent most of the time.

D. He expected too much of her.

2. When the author went out with her father on weekends, she would feel ______.

A. nervous

B. sorry

C. tired

D. safe

3. What does the author think of her father after her visit to Tucson?

A. More critical

B. More talkative

C. Gentle and friendly

D. Strict and hard-working

4. The underlined words "my new friend" in the last paragraph refer to _______.

A. the author's son

B. the author's father

C. the friend of the author's father

D. the cafe owner

已知a、b、c、d四项工作的逻辑关系如下表表示，正确反映该逻辑关系的网络图是（）。

A.A

B.B

C.C

D.D

简述影响吸收过程的主要因素有哪些？

图1是氯碱工业中离子交换膜电解槽示意图，其中离子交换膜是“阳离子交换膜”，它有一特殊的性质——只允许阳离子通过而阻止阴离子和气体通过。

⑴、工业食盐含Ca²⁺、Mg²⁺等杂质。精制过程发生反应的离子方程式为 ▲ ， ▲ 。

⑵、如果粗盐中SO含量较高，必须添加钡式剂除去SO，该钡试剂可以是 ▲ 。

A．Ba(OH)₂       B．Ba(NO₃)₂      C．BaCl₂ 

⑶、为有效除去Ca²⁺、Mg²⁺、SO₄^2-，加入试剂的合理顺序为 ▲ 。

A．先加NaOH，后加Na₂CO₃，再加钡试剂 

B．先加NaOH，后加钡试剂，再加Na₂CO₃   

C．先加钡试剂，后加NaOH，再加Na₂CO₃

⑷、电解后得到的氢氧化钠溶液从 ▲ 口流出，b口排出的是 ▲ 气体，电极1应连接电源的

 ▲ 极（填“正”或“负”极）；理论上讲，从f口加入纯水即可，但实际生产中，纯水中要加入一定量的NaOH溶液，其原因是 ▲ 。

⑸、图2是根据氯碱工业中离子交换膜技术原理，设计的电解Na₂SO₄溶液生产NaOH和H₂SO₄溶液的装置。请回答：

①、a为 ▲ （填“阳”、“阴”）离子交换膜。

②、阳极的电极反应式是 ▲ 。

③、从D、E口流出或流进的物质的化学式分别为 ▲ ， ▲ 。