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【简答题】
Carl studied in our middle school three years ago. Last August his father found a job in another city and his family moved there. He began to study in the new school and we often write to each other. He often tells me something about the city where he lives now and his studies in the school. So I can know what happens to him. Last Friday Carl came to our city again. He hoped to accompany(陪伴) his old grandpa during the summer holiday. He was taller and stronger than before. We swam in the river outside the city together and had a picnic on the island. It surprised me that he had learnt to cook when we were traveling in the wild forest. He told me his parents were both busy and sometimes he stayed at home and he had to look after himself. “How do you like your school?” I asked. “Wonderful,” said the young man.” It has a tall building and there ‘re two chemistry labs, two biology labs and three physics ones. And its library is big and there’re plenty of books in it.” “I can see you are satisfied with it.” “Yes,” he answered. “But our geography teacher often says it himself in class.” “So does our new history teacher.” I said. “But he doesn’t notice it. He often talks on and on in a flow of the eloquence(滔滔不绝), but none of us listens to him.” 小题1: I can know what happens to Carl because________. A.he lives near to me. B.he often calls me C.I often visit him D.he often writes to me. 小题2: Carl came back to our city to________. A.take his summer holiday. B.look after his grandpa C.have a picnic on the island. D.travel in the wild forest. 小题3:________, so he learned to cook. A.Carl liked all kinds of delicious foods. B.Carl had to do some cooking when he was alone. C.Carl found a job in a restaurant. D.Carl often had a picnic with his friends 小题4:Carl is satisfied with his school because__________. A.his teachers work hard. B.it has lots of books C.it has several labs. D.it’s wonderful.
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【单选题】一个码速为300波特得相位不连续的2FSK系统,它的0"码频率f0与“1码频率f1只差为200赫,传输这一信号所需的 较窄频芾宽度约为()。
A.
400赫
B.
800赫
C.
1000赫
D.
300赫
【单选题】一个码速为300波特得相位不连续的2FSK系统,它的“0”码频率f0与“1”码频率f1只差为200赫,传输这一信号所需的较窄频带宽度约为( )。
A.
300赫兹
B.
400赫兹
C.
800赫兹
D.
1000赫兹
【判断题】业余导游人员,亦称兼职导游人员。他们无需经过培训,考核即可上岗
A.
正确
B.
错误
【单选题】可以通过 ( )文本框设置单元格内容和单元格边界之间的像素数
A.
填充
B.
间距
C.
边框
D.
宽和高
【单选题】若二进制数N1的真值为+10011,则其反码为( )。
A.
101010
B.
110101
C.
010011
D.
110110
【简答题】关键词优化的三个方面及具体写作内容
【单选题】一个码速为300波特得相位不连续的2FSK系统,它的“0”码频率f 0 与“1”码频率f 1 只差为200Hz,传输这一信号所需的较窄频带宽度约为( )
A.
300 Hz
B.
400 Hz
C.
800 Hz
D.
1000 Hz
【单选题】一个码速为 300波特得相位不连续的 2FSK系统,它的“ 0”码频率 f0 与“ 1”码频率 f1 只差为 200赫,传输这一信号所需的较窄频带宽度约为( ) 。
A.
300 赫
B.
400 赫
C.
800 赫
D.
1000 赫
【单选题】一个码速为300波特得相位不连续的2FSK系统,它的“0”码频率f0与“1”码频率f1只差为200hz,传输这一信号所需的较窄的频带宽度约为:
A.
300HZ
B.
400HZ
C.
800HZ
D.
1000HZ
【单选题】蛋白质合成旺盛的细胞特点是
A.
细胞明显增大
B.
细胞明显减小
C.
核仁明显增大
D.
核仁明显减小
E.
核仁不变
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