税务机关核定应纳税额的方法有()。A.参照当地同行业中经营规模和收入水平相近的纳税人

动物突然发病死亡，天然孔出血应首先怀疑是( )。

A．猪瘟

B．炭疽

C．羊肠毒血症

D．禽白血病

E．牛出血性败血病

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

以下（）内容不需要设备归档

A.申购计划报告、准购批示、定购合同复本

B.开箱记录及装箱单、验收报告

C.设备管理规则制定

D.监控录像

如图所示，AB为倾角的斜面轨道，轨道的AC部分光滑，CB部分粗糙。BP为圆心角等于143°半径R=1m的竖直光滑圆弧形轨道，两轨道相切于B点，P、0两点在同一竖茛线上，轻弹簧一端固定在A点,另一 0由端在斜面上C点处，现有一质量m = 2kg的物块在外力作用下将弹簧缓慢压缩到D点后（不栓接）释放，物块经过C点后，从C点运动到B点过程中的位移与时间的关系为（式中X单位是m,t单位是s），假设物块笫一次经过B点后恰能到达P点，，g取10m/s²。试求：

(1) 若，试求物块从D点运动到C点的过程中，弹簧对物块所做的功；

(2) B、C两点间的距离x

(3) 若在P处安装一个竖直弹性挡板，小物块与挡板碰撞时间极短且无机械能损火，小物块与弹簧相互作用不损失机械能，试通过计箅判断物块在第一次与挡板碰撞后的运动过程中是否会脱离轨道？

普通沙发的主要结构分为（）、（）、（）三个部分。

A.内架

B.海绵

C.外套

D.软体部分