问题 问答题 简答题

最优的爆破工艺是什么?

答案

参考答案:⑴爆破的破碎矿岩块度应能保证整个工艺费用最低;

⑵一次爆破量应满足强化开采的需要,保证设备避炮,停工损失和爆破超储占用资金损失总和最小;

⑶爆堆规整、利于采掘,在矿岩复杂部位,利于分采分运;

⑷爆破的地震效应、空气冲击波、飞石应得到控制。

选择题
阅读理解

My grandma whom we all called Nanny was a solid, first-generation, Italian immigrant. She came to this country with her family on a tiny ship during World War I when she was only 8 years old. During the trip she survived stormy seas,little food, and an attack by a German U-boat. After getting here,her large family worked hard to build a new life in America. They never had much money but were rich in love.

One day,when I was about 5 or 6 years old, my parents and brothers went on a trip. It was just me and Nanny in the house for the weekend. Nanny seemed so happy to be taking care of me all by herself. She made me a special breakfast that first morning. However, all I could do was to complain about how the food was not how Mom always made it. Nanny quietly put down the plate and went into the living room. I followed a minute later and saw that she had tears in her eyes. It was the first time I had ever seen my strong and proud grandmother cry and I was the one who had caused it.

I walked over to Nanny, climbed on her lap, and for the first time in my short life I did something else too. I apologized without being told to and asked Nanny to forgive me. She smiled, rubbed my head, and told me I was a good boy even though I didn’t feel like one then.

That memory just like my Nanny’s love will stay in my heart forever. It is a sign of both strength and wisdom. Asking for forgiveness helps us to learn, to grow, and to love.

小题1:Nanny,s family immigrated to America mainly because _____.

A.they suffered starvation in their homeland

B.they wanted to start a rich life in the new land

C.they tried to get away from the terrible climate

D.their country was in war and they needed peace小题2:The boy complained to Nanny that the food _____.

A.wasn't cooked the way his mom did

B.was served a bit later than usual

C.was prepared in a special way

D.was just to his parents,taste小题3:When seeing Nanny crying in the living room, the author felt _____.

A.surprised

B.ashamed

C.shocked

D.annoyed小题4:The author mainly wants to tell us that _____.

A.forgiveness can be beneficial to people asking for it

B.hardships can make children more indifferent

C.grandparents are more tolerant than their grandchildren

D.family ties can sometimes be misused