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D When I walked into the house after school, I found my dad at home. 'What are you doing home already?' I asked casually. 'Andrew, I was laid off today,' he answered quietly. I was sure he was joking. 'No, you weren't. Why are you really home?' Then I noticed his expression and realized he was telling the truth. My father has always been a hard worker and prided himself on his career. My father's unemployment created many changes in our lives. He was home all day, which meant my bed had to be made, my room cleaned up, and my homework done right after school. I would come home every day to find him at the computer searching for jobs. I began to notice how down he seemed, and how losing his job had affected his self-esteem (自尊心), though he tried to be optimistic. He asked my brother and me to spend less money. I gave up my allowance(零用钱), which even though it wasn't much, felt like the right thing to do. I also found a part-time job. After several difficult months of searching, my dad decided to go in a totally different direction. He explained that he never wanted to be laid off again, so he was going to start his own business. Day by day, I watched him build it, and I admired how much time and energy he devoted to it. One evening I asked if he needed help. 'Only if it doesn't interfere(打扰,妨碍) with school,' he said, which sounded like a yes. I showed up at his office the next afternoon, and most afternoons after that for two months. I always knew he was a hard worker, but watching him in action really influenced me. Although this was one of the worst experiences for our family, it taught me a lot about dealing with adversity. Now I know that through creative problem-solving, I can always find Plans, ask for help, and take risks. 54.When the father was laid off, he ________. A.was angry with his boss             B.didn't care about it at all C.couldn't accept the fact easily         D.was as happy as usual 55.We can know from the passage that ________. A.it was not easy for the father to find a new job B.the father asked his sons to give up their allowance C.the father found a good job when he changed his direction D.Andrew and his brother helped his father set up his business 56.The underlined word 'adversity' in the last paragraph probably means . A.poor feelings     B.bad situations     C.low spirits     D.old ideas 57.What has Andrew learned from his father? A.The spirit of creative problem-solving.    B.The skills of surfing the Internet. C.The experience of saving money.         D.The rich business skills.
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举一反三
【单选题】In the idiom /' in good feather /', we change /' good/' into /' high, full/' without changing meaning. This change of constituent is known as_____
A.
addition
B.
replacement
C.
position-shifting
D.
variation
【多选题】下面关于二极管的交流等效模型,描述正确的是:( )。
A.
二极管一般是在给定的直流静态工作点的基础上,建立它的交流模型的。
B.
二极管的交流模型就是一个交流等效电阻,其值定义为
C.
依据二极管的交流模型的定义,二极管处在反向截止区时,二端电压的变化值△u为有限值,而二端电流的变化值△i近似为无穷小,于是反向截止区的交流等效电阻近似为无穷大。
D.
二极管导通后的交流等效电阻始终为一个常数值。
【多选题】关于二极管的模型,下面描述正确的是:( )
A.
二极管是非线性元件,需要建立其线性模型,才能方便用线性电路理论进行分析。
B.
二极管的线性模型,可分直流线性模型和交流线性模型。
C.
二极管在不同的工作状态下,又有不同的直流线性模型。
D.
近似线性化的程度不同,二极管的直流线性模型也不同。
【简答题】.(本题满分14分) 本题共有2个小题,第1小题满分6分,第2小题满分8分. 如图所示的自动通风设施.该设施的下部 是等腰梯形,其中 米,梯形的高为 米, 米,上部 是个半圆,固定点 为 的中点.△ 是由电脑控制其形状变化的三角通风窗(阴影部分均不通风), 是可以沿设施边框上下滑动且始终保持和 平行的伸缩横杆. (1)设 与 之间的距离为 米,试将三角通风窗 的通风面积 (平方米)表示成关于 的函...
【简答题】计算三角形面积,如下图所示。其中,第1行的三个文本框的名称分别为:txtA、txtB、txtC;第2行的那一个文本框的名称为txtResult。要求完成“计算”按钮中的代码编写。 提示: p = (a + b + c) / 2 s =
【单选题】加工锻造毛坯零件时,G73指令粗加工后,使用( )进行精加工。
A.
G70
B.
G7
C.
G72
D.
G76
【简答题】如图:一正方形纸片,根据要求进行多次分割,把它分割成若干个直角三角形.具体操作过程如下: 第一次分割:将正方形纸片分成4个全等的直角三角形;第二次分割:将上次得到的直角三角形中的一个再分成4个全等的直角三角形;以后按第二次分割的方法重复进行. (1)请你设计出两种符合题意的分割方案(分割3次); (2)设正方形的边长为a,请你通过对其中一种方案的操作和观察,将第二、第三次分割后所得的最小的直角三角...
【多选题】下面关于二极管的交流等效模型,描述正确的是:()。
A.
实际应用中,二极管有时需要在给定的直流静态工作点的基础上,建立它的交流模型的。
B.
二极管的交流模型定义为一个交流等效电阻,其值定义为
C.
依据二极管的交流模型的定义,二极管处在反向截止区时,二端电压的变化值△u为有限值,而二端电流的变化值△i近似为无穷小,于是反向截止区的交流等效电阻近似为无穷大。
D.
二极管导通后的交流等效电阻始终为一个常数值。
【多选题】关于二极管的模型,下面描述正确的是:( )
A.
二极管是非线性元件,需要建立其线性模型,才能方便用线性电路理论进行分析。
B.
二极管的模型,可分直流模型和交流模型。
C.
二极管在不同的工作状态下,又有不同的直流模型。
D.
近似线性化的程度不同,二极管的直流线性模型也不同。
【单选题】加工锻造毛坯零件时,G73指令粗加工后,使用()进行精加工。
A.
G70
B.
G71
C.
G72
D.
G01
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