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阅读理解 David came from a poor family. When he finished his high school, however, he was given a wonderful present. 'Some of my friends got new clothes and a rich boy even got a new car,' he remembered, 'My dad reached into his trousers pocket and took something out. I held out my hand, and his present dropped into it-a nickel(五分镍币).' Dad said to me, 'Buy a newspaper with that. Read every word of it. Then turn to the classified section(分类栏目)and get yourself a job. Get into the world. It's all yours now.' I always thought that was a great joke my father had played on me until a few years later when I was in the army, sitting in a foxhole(战壕), and thinking about my family and my life. It was then I realized that my friends had got only new cars, or only new clothes. My father had given me the whole world. What a great present!' 1. When David left school, he received ______ as a present. A. a new car B. new clothes C. both A and B D. hardly anything 2. David's father asked him to _____. A. learn how to read a newspaper B. get a job by himself C. play a joke D. remember the classified section 3. The title of the passage may be ________. A. How to Be a Soldier B. How to Find a Job C. A Great Joke D. A Great Present 4. What did David think of his present from his father at first? A. It was a joke. B. It was a great present. C. He disliked it. D. The present was expensive 5. What did David become a few years later? A. A college student. B. A rich person. C. A soldier. D. A newspaper reporter.
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【单选题】电阻元件的正弦交流电路中,电压有效值不变,当频率增大时,电路中电流将( )。
A.
增大
B.
减小
C.
不变
【单选题】电阻元件的正弦交流电路中,电压有效值不变,频率增大时,电路中电流将( )
A.
增大;
B.
减小;
C.
不变
D.
先增大,后减小
【多选题】蝴蝶兰组织培养过程中,感染病毒的途径有
A.
母本材料带毒
B.
继代培养转接过程中感染
C.
操作不当带毒
D.
材料消毒不彻底
【单选题】电阻元件的正弦交流电路中,电压有效值不变,当频率增大时,电路中电流将()
A.
增加
B.
减小
C.
不变
D.
不一定
【多选题】蝴蝶兰组织培养过程中,感染病毒的途径有
A.
母本材料带毒
B.
培养过程感染
C.
操作不当带毒
D.
消毒不彻底
【单选题】正弦交流电路中:灯泡、电阻和电感元件串联。已知电源电压为 220 V ,频率 f=50 Hz 时,电路发生谐振。现将电源的频率增加,电压有效值不变,这时灯泡的亮度( )
A.
比原来亮
B.
比原来暗
C.
和原来一样亮
【单选题】习近平总书记曾指出,实现中国梦必须走( )、弘扬( )、凝聚( )
A.
中国道路、中国文化、中国力量
B.
中国道路、中国精神、中国力量
C.
中国道路、中国理论、中国精神
D.
中国道路、中国精神、中国人心
【单选题】在电阻、电感元件串联的正弦交流电路中,电压有效值不变,当频率增大时,电路中电流将 。
A.
增大
B.
减小
C.
不变
D.
不确定
【判断题】自2007年起,每年举办一次山东省职业院校技能大赛。
A.
正确
B.
错误
【单选题】曲柄 OA=l ,由转矩 M 使其绕一固定滑轮的中心转动,滑轮半径为 r 。曲柄的一端 A 上带一个动滑轮,其半径为 r 。定滑轮与动滑轮使用皮带联接,皮带被拉紧,当系统运动时,皮带不沿轮缘滑动,设曲柄为均质杆,重为 P ,滑轮重 Q ,机构在水平面内,试求曲柄的角加速度 __________________ 。
A.
B.
C.
D.
D
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