切平面与圆锥轴线倾斜时,所得圆形截交线为()。A.圆 B.正椭圆 C.蛋形对称近似椭

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问题:

切平面与圆锥轴线倾斜时,所得圆形截交线为()。

A.圆

B.正椭圆

C.蛋形对称近似椭圆

考点:冷作钣金工铆工(初级)铆工(初级)题库
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从“和平使命——2005”、“和平使命——2007”,一直到“和平使命——2009”,和平使命系列军演已经成为世界著名的反恐军演品牌,这也是上海合作组织向全世界展示自己的一种姿态。以下对上海合作组织认识正确的有

①由中国领导创立的全球性国际组织,2001年在上海正式成立

②它的成立标志着一个以互信求安全,以互利求合作的新型区域合作组织的诞生

③联合打击恐怖主义是该组织的重要目标之一

④该组织成员国的合作目前仅限于军事、政治领域,尚未涉及经济等其他领域[ ]

A.①③

B.②③

C.②④

D.①④

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下列传染病引起白细胞总数减少的是()

A.败血病

B.猩红热

C.疟疾

D.流行性脑脊髓膜炎

E.伤寒

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水位计汽水旋塞堵塞的原因不包括()。

A.经常吹洗

B.锅水排污工作不及时

C.没有按要求进行定期检修和除垢

D.进入锅炉的水含盐量高

题型:单项选择题

I will never forget the year I was about twelve years old. My mother told us that we would not be (16) Christmas gifts because there was not enough money. I felt sad and thought, "What would I say when the other kids asked what I’ d (17) " Just when I started to (18) that there would not be a Christmas that year, three women (19) at our house with gifts for all of us. For me they brought a doll. I felt such a sense of (20) that I would no longer have to be embarrassed when I returned to school. I wasn’t (21) . Somebody had thought (22) of me to bring me a gift.

Years later, when I stood in the kitchen of my new house, thinking how I wanted to make my (23) Christmas there special and memorable, I (24) remembered the women’s visit. I decided that I wanted to create that same feeling of (25) for as many children as I could possibly reach.

So I (26) a plan and gathered forty people from my company to help. We gathered about 125 orphans (孤儿) at the Christmas party. For every child, we wrapped colorful packages filled with

toys, clothes, and school supplies, (27) with a child’ s name. We wanted all of them to know they were (28) Before I called out their names and handed them their gifts, I (29) them that they couldn’t open their presents (30) every child had come forward. Finally the (31) they had been waiting for came as I called out, "One, two, three. Open your presents!" As the children opened their packages, their faces beamed and their bright smiles (32) up the room. The (33) in the room was obvious, and (34) wasn’ t just about toys. It was a feeling, and the feeling I knew (35) that Christmas so long ago when the women came to visit. I wasn’t forgotten. Somebody thought of me. I matter.

23()

A.present 

B.first 

C.recent 

D.previous

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在现场检验电能表时,还应检查哪些计量差错?

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