将炉料运至炉顶的设备属于哪个系统()A、高炉本体 B、上料系统 C、装料系统 D、上

题型:单项选择题

问题:

将炉料运至炉顶的设备属于哪个系统()

A、高炉本体

B、上料系统

C、装料系统

D、上料机

考点:炼钢工转炉炼钢工考试转炉炼钢工考试题库
题型:单项选择题
已知矩阵A=[
x3
2y
],α=[
4
-1
],且Aα=[
9
4
].
(1)求实数x,y的值;
(2)求A的特征值λ1,λ2(λ1>λ2)及对应的特征向量
α1
α2

(3)计算A20α.
题型:单项选择题

下列有关密度的说法,正确的是(  )

A.一滴水的密度小于一桶水的密度

B.液体的密度一定小于固体的密度

C.因为铝比铁轻,所以铝的密度小于铁的密度

D.密度是物质的一种特性

题型:单项选择题

In white shirt, blue pants, black cloth shoes and two pigtails, Jingqiu gives off an air of great "pure beauty" in Zhang Yimou’s new movie Under the Hawthorn Tree, which tells the story of the sad romance of Jingqiu and a handsome young man named Laosan set at the end of the "cultural revolution" (1966-- 1976).

Before it was released, moviegoers foresaw what this "pure beauty" could be. Director Zhang complained of how long it had taken him to find the right girl for the part of Jingqiu -- a character so innocent. She believes that simply lying on the same bed as a man will make her pregnant.

It was 18-year-old Zhou Dongyu who stood out from the crowd. According to Zhang, Zhou has "eyes that are clear like a fountain on a mountainside". Born to an ordinary worker's family, the Shijiazhuang girl was in her final year of high school and working hard for a place in an art college.

"If you have fair skin and clear eyes, as Jingqiu does, it is easy to look pure. Girls today wear so many jewels and make-up--that's the reason Zhang was not interested," said Du Yanlai, 17, of Chengdu.

While some teenagers consider such "pure" beauty illusory, others believe that it speaks of something soulful.

Purity is all about an innocence that shines through from within, thinks 16-year-old Tan Mengxi of Nanjing. "Being pure can be simple, not having complicated thoughts and being inexperienced. However, it doesn't mean an ignorant or native person. So, a person is pure in his or her nature if he or she is always enthusiastic and able to deal with difficult matters independently. This purity doesn't pass with time, "she said.

小题1:What's the real purity according to Tan Mengxi?

A.Having eyes as clear as a fountain.

B.Not wearing so many jewels and make-up.

C.Being ignorant and native.

D.Being simple, enthusiastic and able to manage things alone.小题2:What does the underlined word “illusory” mean here?

A.unreal.

B.unhealthy.

C.unscientific.

D.negative.小题3:What can we infer from the passage?

A.Zhou Dongyu, who was 18,was from an art college.

B.Director Zhang disliked those girls with so many accessories and make-up.

C.Different people have different opinions about purity.

D.Many young girls in China are eager to stand out.小题4:The main idea of the passage is ______.

A.Why Director Zhang selected Miss Zhou as the leading star

B.How people like the movie Under the Hawthorn Tree

C.What makes a pure girl

D.Why Chinese girls want to be pure

题型:单项选择题

采掘工作面的进风中,氧气浓度不得低于()%,二氧化碳不超过()%。()

A.12;0.005

B.21;0.5

C.20;0.5

D.160;0024

题型:单项选择题

对轴的强度要求,是保证轴能正常工作的一个()条件。

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