某大型设备原值40万元，折旧年限规定为8年，预计月平均工作250小时，预计净残值率为

已知正方体、球、底面直径与母线相等的圆柱，它们的表面积相等，则它们的体积的大小关系是（　　）

A．V_正方体=V_圆柱=V_球

B．V_正方体＜V_圆柱＜V_球

C．V_正方体＞V_圆柱＞V_球

D．V_圆柱＞V_正方体＞V_球

依据产生风险的行为分类，海啸、地震、洪水、经济衰退等属于( )。

A．基本风险

B．静态风险

C．纯粹风险

D．自然风险

George, when your big brother and your little dog and I walked you up to schools today, you

had no idea how I was feeling.

You were so excited. You had packed and unpacked your pencils and safety scissors in your backpack a dozen times. I am really going to miss those lazy mornings when we waved your brother and sister off to school.

Because you are my youngest, I had learned a few things by the time you came along. I found out that the seemingly endless days of babyhood are gone like lightning. I blinked(眨眼), and your older siblings were setting off for school as eagerly as you did this morning, I was one of the lucky ones; I could choose whether to work or not. By the time it was your turn, the shining prizes of career advancement and a double income had lost their brightness. A splash(溅水) in the pool with you in your bright red boots or "just one more" rereading of your favorite book, Frog and Toad Are Friends, meant more. You didn't go to preschool and I hope that doesn't hold you back. You learned numbers by helping me count the soda cans we returned to the store.

I have to admit that in my mind's eye, an image of myself while you're in school has developed, I see myself updating all the photo albums and starting that novel I always wanted to write. As the summer wound down and more frequent quarrels erupted between you and your siblings, I was looking forward to today. And then this morning, I walked you up the steep hill to your classroom. You found the coat hook with your name above it right away, and you gave me one of your characteristically fierce, too-tight hugs. This time you were ready to let go before I was.

Maybe someday you will deliver a kindergartner to the first day of school. When you turn at the door to wave good-bye, he or she will be too deep in conversation with a new friend to notice. Even as you smile, you'll feel something warm on your cheek.

And then, you’ll know…

64．What does the author mean by the underlined sentence?

A．She gave up the job with a big salary and prizes.

B．She could only recall her good job at home now.

C．Many good jobs with better pay attracted her but she didn’t take them.

D．Compared with bringing up the baby, work seemed to fade to her.

65．Which statement is NOT TRUE about George’s family according to the letter?

A．George’s parents gave birth to three children

B．The Georges is a double income family.

C．The children had more arguments during the summer.

D．They recyled soda cans.

66．The passage tries to show us         .

A．how excited a child will be on his first day to school

B．how deeply a mother loves her child

C．how many efforts a mother has made to raise a child

D．how a mother plans her future life after her children go to school

下图说明城市经济体制改革后

①国有企业，集体企业的比重明显下降 ②城市个体及其他企业成分占有较大比重

③由单一公有制经济向公有制经济为主体的多种所有制经济转变④国有企业改革已经完成

A．①②③④

B．①②③

C．②③④

D．①③④

如何判断煤质变差和煤浆浓度过稀？