问题 问答题 简答题

省煤器爆管的现象有哪些?

答案

参考答案:

(1)在省煤器附近可以听到异常声响,省煤器的不密闭处向外冒汽,严重损坏时会在省煤器下部的灰斗内出现湿灰,甚至有水流出,冒出大量蒸汽。

(2)锅内水位下降,锅炉的给水量大于蒸发量。

(3)排烟温度异常下降,引风阻力增大,引风机电流增大、声音异常。注意观察时,发现烟气的颜色变成灰白或白色。

阅读理解

阅读理解

    One day when Jack was walking inthe park, he saw a woman he knew sitting on a bench(长椅)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”Jack said, pointing(指向)at the animal.

    “Yes, he's handsome. He's a bit of a mixture(混合) 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.”

    The two friends laughed and then Jack said, “Does your dog bite?”

    "No,” Sue said. “He's never bitten anyone. He's always gentle and good-tempered(好脾气).”

    Hearing this, Jack decided to pet the dog. He put out his hand and touched the animal's head. Immediately it jumped up and bit him.

    “Hey!” Jack shouted. “You said he didn't bite.”

    "No, I didn't,”Sue replied.  “You asked,if my dog bit, and I said no.

51. What did Jack do when he saw the woman?

    A. He walked past her.

    B. He asked to sit next to her.

    C. He spoke angrily to her.

    D. He spoke to her dog.

52. The dog looked_________.

    A. angrily at Jack                          B. sick

    C. as if he would bite Sue                   D. hungry

53. Jack thought that the dog

    A. was ill                                B. belonged to Sue

    C. was terrible                            D. belonged in a zoo

54. The underlined word “pet” should be ______________in Chinese.

    A.宠物              B.喜欢

    C.敲打              D.抚摸

55. From the story, we can know______________.

    A. Jack and Sue talked about the same dog

    B. Jack asked Sue a right question

    C. Jack was bitten by Sue's dog

    D. Jack asked Sue a wrong question

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