软水密闭循坏系统的特点？

阅读下面材料，从每题中所给的A、B、C、D四个选项中，选出一个最佳答案。

　One day when Jack was walking in the park, he saw a woman, who lived a few miles away, sitting on a

bench with a dog beside her. The dog was looking up at the woman. 　　

    Jack walked up to the woman and said, "Hello, Sue, how are you? May I sit and talk with you for a while?"

"Of course, please sit down," Sue said. Jack sat down next to Sue on the bench, and they talked quietly together.

The dog continued to look up at Sue, as if waiting to be fed. 　　

    "That's a nice dog, isn't he?" Jack said, pointing at the animal. 　　

    "Yes, he is. He's handsome. He's a bit of a mixture, but that's not a bad thing. He's strong and healthy." 　　

    "And hungry, "Jack said." He hasn't taken his eyes off you. He thinks you've got some food for him." 　　

    "That's true, "Sue said." But I haven't." 　　

    They both laughed and then Jack said, "Does your dog bite?" 　　

    "No, "Sue said, "He's never bitten anyone. He's always gentle and friendly." 　　

    Hearing this, Jack decided to hold out his hand and touched the animal's head. Suddenly it jumped up and bit

him. 　　

    "Hey!" Jack shouted." You said your dog didn't bite." 　　

    Sue replied in surprise, "Yeah, I did. But this is not my dog. My dog's at home."

1. The dog looked at the woman because            . [ ]

A. the woman wanted to feed him 　　

B. the woman was friendly 　　

C. he was strong and healthy 　　

D. he was hungry

2. Jack and Sue were            . [ ]

A. friends

B. next-door neighbors 　　

C. strangers

D. in the same family

3. Jack touched the dog because he believed            . [ ]

A. the dog was handsome 　　

B. Sue's dog was unfriendly 　　

C. the dog belonged to Sue 　　

D. Sue's dog was at home

4. We can infer form the passage that            . [ ]

A. Sue gave a wrong answer 　　

B. Jack made a mistake 　　

C. the dog wasn't dangerous 　　

D. both Jack and Sue liked the dog

5. Which of the Following can be the best title of the passage? [ ]

A. A Wrong Question

B. Sue's Dog

C. A pleasant Meeting

D. Sue's Friend

在卷扬机的使用中，如果实际使用的钢丝绳的直径与卷扬机铭牌上标明的直径不同时，必须进行（）校核。

A.容绳量 

B.工作速度 

C.卷筒强度 

D.额定牵引拉力

关于前列腺增生症，下列描述正确的是（）

A.前列腺增生结节绝大多数发生在中央叶

B.增生结节T加权像可呈低信号

C.增生结节T加权像可呈高信号

D.增生结节周围可见环形低信号

E.上述各项全都正确

某股份有限公司采用移动加权平均法计算发出材料的实际成本，并按成本与可变理净值孰低法对期末存货计价。该公司2005年12月1日甲种材料的结存数量为200千克，账面实际成本为40000元;12月4日购进该材料300千克，每千克单价为180元(不含税，下同)12月10日发出材料400千克12月15日又购进该材料500千克，每千克单价为200元12月19日发出材料300千克，12月27日发出材料100千克。若2005年12月月初“存货跌价准备——甲材料”科目的贷方余额为500元，2005年年末甲材料的可变现净值为每千克220元，则该公司2905年12月31日甲材料的账面价值为 ( )元。

A．19000

B．89600

C．39800

D．79200

我国古代城池内布局采用城郭之制，郭城内还实行里坊制度，直到，这种封闭式里坊制才被开放式的街巷式制取代，形成了民居、商业店铺交互错杂的局面。（）

A、唐代

B、南宋

C、北宋

D、明代