液压式上击器的操作方法?

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问题:

液压式上击器的操作方法?

考点:井下作业工井下作业工技师井下作业工技师题库
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长效碳铵的特点有那些?

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“平面上两条直线的斜率的乘积等于-1”是这两条直线垂直的______条件.

(填“充分不必要”或“必要不充分”或“充要”或“既不充分也不必要”)

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已知双曲线C与双曲线
x2
3
-y2
=1有相同的渐近线,且过点A(
3
,-3),则双曲线C的标准方程是______.
题型:问答题 简答题

阅读理解。

     What makes a gift special? Is it the price you see on the gift receipt? Or is it the look on the recipient's

face when they receive it that determines the true value? What gift is worth the most?

     This Christmas I was debating what to give my father. My dad is a hard person to buy for because he

never wants anything. I pulled out my phone to read a text message from my mom saying that we were

leaving for Christmas shopping for him when I came across a message on my phone that I had locked.

The message was from my father. My eyes fell on a photo of a flower taken in Wyoming, and underneath

a poem by William Blake. The flower, a lone dandelion standing against the bright blue sky, inspired me. My dad had been reciting those words to me since I was a kid. That may even be the reason why I love

writing. I decided that those words would be my gift to my father.

     I called back. I told my mom to go without me and that I already created my gift. I sent the photo of

the cream-colored flower to my computer and typed the poem on top of it. As I was arranging the details another poem came to mind. The poem was written by Edgar Allan Poe; my dad recited it as much as he

did the other. I typed that out as well and searched online for a background to the words of it. The poem was focused around dreaming, and after searching I found the perfect picture. The image was painted with blues and greens and purples, twisting together to create the theme and wonder of a dream. As I watched both poems passing through the printer, the white paper coloring with words that shaped my childhood, I

felt that this was a gift that my father would truly appreciate.

     Christmas soon arrived. The minute I saw the look on my dad's face as he unwrapped those swirling

black letters carefully placed in a cheap frame, I knew I had given the perfect gift.

1.  The idea for a special gift began to form when the author was _________.

A. doing shopping

B. having a debater

C. reading a message

D. leaving for Wyoming

2. The author's inspiration for the gift came from _________.

A. a photo of a flower

B. a story about a kid

C. a call from the mother

D. a text about Christmas

3. The underlined word "it" in Paragraph 3 refers to a poem by _________.

A. the father

B. the author

C. William Blake

D. Edgar Allan Poe

4. The author made the gift by _________.

A. searching for the poems online

B. drawing the background by hand

C. painting the letters in three colors

D. matching the words with pictures

5. What is the main purpose of the passage? 

A. To show how to design images for gifts.

B. To suggest making gifts from one's heart.

C. To explain how computers help create gifts.

D. To describe the gifts the author has received.

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简述教师的职责。

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