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阅读理解 Can you remember the day when you spoke your first words? It you can, you are unusual. Try to think what the first few months of your life were like. I'm sure you just spent most of your time eating, sleeping and crying. As you grew older, you were awake more of the time. It look your parents more to play with you and talk to you .You watched and listened. You began to know that people make some sounds to go with some things. Then you began to cry to make sounds you heard. And step by slop you were able to make sounds you heard .And step by step you were able to make the right sound for one thing. On that day you came to understand the secret of the language. The secret is that a certain sound means a certain thing. One sound might be as good as another. But it is not as good as a word unless everyone agrees on its meaning. Only when a group of people use the same set of sounds of things. they can understand each other, so these people have a language. After you found the secret of language, you learned words.  Some of the words meant thing, such as books, chair and shops.  Some of the words meant actions such as go and swim. And other words describe things such as good or dirty. Soon you learn to put words together to express one's idea, such as 'I want to go out and play with my friends.' This is language. By the way of language people can communicate. So we say languages mean communication. 1. can remember the day when we spoke our first words. A. Few of us B. No one C. Most people D. Someone 2. When you were a little baby. You A. made sounds to let people know that you wanted to eat B. spent most of your time eating, playing and sleeping C. could not hear any sounds around you D. spent most of your time playing with your parents 3. The secret of language is that . A. one sound might be as good as another B. a certain sound is for a certain thing C. people can understand each other D. there is a special sound for each other 4. You could learn words . A. before you knew what language was B. when you were a baby C. if you knew what language was D. after you knew what language was 5. The use of language is . A. to get everything one wants from another B. to say what one wants to know C. to make oneself understood by others D. to share ideas, opinions, news, etc. with one another
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【多选题】平面运动的刚体作瞬时平动时,则该瞬时刚体的角速度 (), 角加速度 ()
A.
必须等于零
B.
可以为零,也可以不为零
C.
必须不等于零
【单选题】关于晶闸管的下列说法错误的是()。
A.
若控制端与阴极间不加正向电压,则无论在阳阴极间加多大的正向电压,管子均不会导通
B.
具有与二极管不完全一致的单向导电性
C.
在一定范围内,随着正向控制电压的升高,管子阳阴极间的导通变得越容易
D.
阳阴极间加正向6V直流电压时,使晶闸管导通的控制极最小电压为其触发电压
【简答题】(10分)透明聚酯玻璃钢可用于制造导弹的雷达罩和宇航员使用的氧气瓶。制备它的一种配方中含有下列四种物质: 填写下列空白: (1)下列试剂能与甲反应而褪色的是___________(填标号) a. Br 2 /CCl 4 溶液   b.石蕊溶液   c.酸性KMnO 4 溶液 (2)甲的同分异构体有多种,写出其中一种不含甲基的羧酸的结构简式:_______ (3)淀粉通过下列转化可以得到乙(其中A—...
【单选题】设int n=3;则十十n的结果是,n的结果是
A.
2.0
B.
3.0
C.
4.0
D.
5.0
【判断题】刚体作瞬时平动时,刚体的角速度和角加速度在该瞬时一定都是等于零的。
A.
正确
B.
错误
【单选题】下列说法正确的是
A.
硅二极管和锗二极管的单向导电性一样
B.
理想二极管导通时,阳极和阴极电位相等
C.
二极管反偏时,不管反偏电压多大,都不会有电流
D.
二极管具有单向导电性,即使电源频率很高也可以保持单向导电性
【简答题】《有机化学基础》 (1)了解有机物的分类和命名,有助于更好地研究有机物. ①下列物质属于醇的是______(填选项字母,下同). a. b. c. ②邻羟基苯甲酸的结构简式是______. a. b. c. ③有机物 的名称为______. a.2-甲基-2-乙基丙烷b.3,3-二甲基丁烷c.2,2-二甲基丁烷 (2)对于分子式为C 4 H 10 O的有机物各种同分异构: ① 核磁共振氢谱有___...
【简答题】(14分)透明聚酯玻璃钢可用于制造导弹的雷达罩和宇航员使用的氧气瓶。制备它的一种配方中含有下列四种物质: 填写下列空白: (1)甲中不含氧原子的官能团名称是________;下列试剂能与甲反应而褪色的是________(填标号)。 a.Br 2 /CCl 4 溶液    b.石蕊溶液    c.酸性KMnO 4 溶液 (2)甲的同分异构体有多种,写出其中一种不含甲基的羧酸的结构简式:_______...
【判断题】刚体作瞬时平动时,刚体的角速度和角加速度在该瞬时一定都等于零。
A.
正确
B.
错误
【判断题】刚体平面运动仅仅动系的原点固结在刚体上的已知信息的基点,而坐标轴与刚体无关,动系作平动。如此的方法使得动点到动系原点的连线相对动系的角速度和角加速度与刚体的绝对角速度和绝对角加速度相同,同时一定不会出现出现科氏加速度,牵连点的速度加速度就是与基点的相同。
A.
正确
B.
错误
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