为什么盛钢桶桶底采用吹氩处理钢液?

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问题:

为什么盛钢桶桶底采用吹氩处理钢液?

考点:炼钢工电炉炼钢工中级电炉炼钢工中级题库
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下列各组中,属于原络配穴的是()

A.大陵、内关

B.内关、外关

C.太渊、合谷

D.神门、支正

E.太白、冲阳

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下列纳税人不可以采取税收保全措施的是()

A.从事生产、经营的纳税人

B.不从事生产、经营的纳税人

C.扣缴义务人

D.纳税担保人

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个人经营类贷款是指银行向从事合法生产经营的()发放的贷款。

A.家庭

B.法人

C.企业

D.个人

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阅读理解

     In the kitchen of my mother's houses there has always been a wooden stand (木架) with a small

notepad (记事本)and a hole for a pencil.

     I'm looking for paper on which to note down the name of a book I am recommending to my mother.

Over forty years since my earliest memories of the kitchen pad and pencil, five houses later, the current

paper and pencil look the same as they always did. Surely it can't be the same pencil? The pad is more

modern, but the wooden stand is definitely the original one.

     "I'm just amazed you still have the same stand for holding the pad and pencil after all these years." I

say to her, walking back into the living-room with a sheet of paper and the pencil. "You still use a pencil.

Can't you afford a pen?"

      My mother replies a little sharply. "It works perfectly well. I've always kept the stand in the kitchen.

I never knew when I might want to note down an idea, and I was always in the kitchen in those days."

     Immediately I can picture her, hair wild, blue housecoat covered in flour, a wooden spoon in one

hand, the pencil in the other, her mouth moving silently. My mother smiles and says, "One day I was

cooking and watching baby Pauline, and I had a brilliant thought, but the stand was empty. One of the

children must have taken the paper. So I just picked up the breadboard and wrote it all down on the

back. It turned out to be a real breakthrough for solving the mathematical problem I was working on."

     This story-which happened before I was born-reminds me how extraordinary my mother was, and is,

as a gifted mathematician. I feel embarrassed that I complain about not having enough child-free time to

wor k. Later, when my mother is in the bathroom, I go into her kitchen and turn over the breadboards.

Sure enough, on the back of the smallest one, are some penciled marks I recognize as mathematics.

Those symbols have travelled unaffected through fifty years, rooted in the soil of a cheap wooden

breadboard, invisible (看不到的) exhibits at every meal.

1. Why has the author's mother always kept the notepad and pencil in the kitchen?

A. To leave messages.

B. To list her everyday tasks.

C. To note down maths problems.

D. To write down a flash of inspiration.

2. What is the author's original opinion about the wooden stand?

A. It has great value for the family.

B. It needs to be replaced by a better one.

C. It brings her back to her lonely childhood.

D. It should be passed on to the next generation.

3. The author feels embarrassed for             .

A. blaming her mother wrongly

B. giving her mother a lot of trouble

C. not making good use of time as her mother did

D. not making any breakthrough in her field

4. What can be inferred from the last paragraph?

A. The mother is successful in her career.

B. The family members like travelling.

C. The author had little time to play when young.

D. The marks on the breadboard have disappeared.

5. In the author's mind, her mother is             .

A. strange in behaviour

B. keen on her research

C. fond of collecting old things

D. careless about her appearance(B)

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在Excel中”删除”命令和”删除工作表”命令是等同的。

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