钢中Mn/Si大于（）可以得到完全液态的脱氧产物，能改善钢水的流_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

钢中Mn/Si大于（）可以得到完全液态的脱氧产物，能改善钢水的流动性。

A．1

B．2

C．3

答案

参考答案：C

单项选择题

计算机控制的液压同步提升技术和无线遥控液压同步技术主要应用于( )。

A．汽车生产线

B．通用机械设备

C．大型构件和设备

D．压力管道

完形填空

Ｍy second father
My father died when I was five. It was hard on us all. My brother, who is eight years older than me, began to __36____my mother and me. He made sure the trash was taken out and the yard mowed. He did this _37____ without being told to do so.
Because of my father’s death, my mother was __38___ to get a full time job. My brother, __39____ , would get me up for school and make me __40____ . On our way to school, he would play games with me. He made every__41___to make me happy and he succeeded __42____.
When we arrived home from school, we were__43____for about half an hour until mom was home from work. He would__44____something for supper, and have everything ready for mom __45___she could start cooking. After that, we would go outside and have some __46___. This was my brother’s time to be a(n)___47___ , enjoying himself in the games.
It was a Saturday in June a couple years later. My mother and I were at the store when I __48____ they had the Father’s Day cards out. Feeling __49___, I asked my mother why they hadn’t Brother’s Day cards. She smiled and said, “You’re right.___50___ your brother has been a father to you. Go and__51____ a card.”
So I did, and on Father’s Day, my mother and I _52__ my brother down and gave him the card.
As he read it, I saw the tears __53____ in his eyes. I heard my mom’s __54____ trembling as she said, “Son, your father is proud of you, seeing that he___55___ a good man. We love you, and thank you.”

A．independent

C．disappointed

D．Without doubt