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【简答题】
Choose the proper topic sentence for each paragraph. A. I lived in a small town when I was a child. B. When I have my own children, I want to move to a small town. C. The town I live in is very small. D. There are two main advantages of living in a small town. 1. _____________ I don't want my children to live in a big city because a big city is not as friendly or as safe as a village. I want to move to the village where my grandparents live. The children can play in the street there and everyone knows each other. 2. __________________ First, you know everyone and everyone knows you. This helps you to feel safe, and it is friendlier. Secondly, it is quiet and there are fewer cars. This means there is less pollution than in a big town or city. 3. __________________ It was a very nice place to live then. Now it is much bigger than before. More people live there and some big businesses opened offices there. My parents still live there but they say it was better in the past. 4. ________________ There are only a few food shops and one school here. Most people go to the big city to go shopping for clothes and gifts. There is a doctor’s but there isn’t a hospital. Again, you need to go to the city if you need the hospital. However, our town is very nice and it has a beautiful park.
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举一反三
【简答题】具有“塞上江南”美称的是______.
【多选题】用窗函数设计法设计线性相位FIR滤波器时,说法正确的是( )
A.
增加窗口长度N只能相应地减小过渡带宽度,而不能改变肩峰值
B.
旁瓣峰值衰耗适用于窗函数,它是窗谱主副瓣幅度之比,即旁瓣峰值衰耗=20lg(第一旁瓣峰值/主瓣峰值)
C.
阻带最小衰耗适用于滤波器。工程上习惯于用相对衰耗来描述滤波器。相对衰耗定义为。当滤波器是用窗口法得出时,阻带最小衰耗取决于窗谱主副瓣面积之比。
D.
用矩形窗时肩峰值出现在滤波器截止频率处
【判断题】“东方快餐”之称的嘉兴五芳斋粽子号称“江南粽子大王”。( )
A.
正确
B.
错误
【单选题】きのうは 水曜日ではありませんでした 。
A.
きのうは水曜日ではありません
B.
きのうは水曜日ではない
C.
きのうは水曜日ではなかった
【单选题】某元素最外层电子数为 5 ,它处在周期表
A.
Ⅴ A
B.
Ⅶ A
C.
Ⅳ A
D.
Ⅰ A
【判断题】若将同一转速同一型号离心泵分别装在一条阻力很大,一条阻力很小的管路中进行性能测量时,其测出泵的性能曲线就不一样.
A.
正确
B.
错误
【判断题】若将同一转速同一型号离心泵分别装在一条阻力很大,一条阻力很小的管路中进行性能测量时,其测出泵的性能曲线就不一样。
A.
正确
B.
错误
【判断题】若将同一转速的同一型号离心泵分别装在一条阻力很大、一条阻力很小的管路中进行性能测量,其测出泵的性能曲线就不一样
A.
正确
B.
错误
【简答题】具有“塞上江南”美称的是_____________ 。
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