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【简答题】
阅读下列短文,完成短文后面的表格内容。(各小题不超过5个词) George Stephenson was born in 1781 in a poor family. He had to start work when he was only eight. When George was fourteen, he became his father’s helper. He spent a lot of time learning about engines. On holidays, he often took engines into pieces and studied each piece carefully. Soon he became a very good worker though he could not read or write. He began to learn the English letters when he was seventeen years old. Every day after he did twelve hours of hard work, he walked a long way to have lessons from a young teacher. On his eighteenth birthday, he wrote his own name for the first time in his life. George invented many things in his life. The train was the greatest one among them. Today when we watch or take trains from one place to another, we will think of this great man ------George Stephenson. Great Inventor: 小题1: ____ In 小题2: ____ He started work. In1795 He spent much time 小题3: . In 1798 He began to learn the English letters. In 1799 He could 小题4:for the first time.____ In his life He invented many things, including 小题5: .
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【单选题】对于晶体二极管来说,以下说法错误的是()
A.
正向电阻很小
B.
无论加多大的反向电压,都不会导通
C.
未被反向击穿前,反向电阻很大
D.
所加正向电压大于死区电压时,二极管才算真正导通
【单选题】对牙髓感染或外伤所致的牙髓坏死的患者,目前临床上一般采用根管治疗。下列关于根管治疗的说法错误的是
A.
一般需要拍摄术前、中、后共3次X光片
B.
先常规去龋、揭顶、形成直达根管的直线通路,拔除炎症牙髓,并以化学或机械方法清理髓腔,疏通扩大根管,为根管充填创造空间
C.
然后适当地根管封药处理后,完善根管充填
D.
最后可根据患者情况不进行冠方的垫底、充填与冠修复
【判断题】启动子是RNA聚合酶结合的部位,不属于顺式作用元件
A.
正确
B.
错误
【单选题】光纤通信系统中常用的光源主要有( )
A.
光检测器、光放大器、激光器
B.
半导体激光器、光检测器、发光二极
C.
PIN光电二极管、激光、荧光
D.
半导体激光器L
E.
半导体发光二极管
【单选题】光纤通信系统中常用的光源主要有:
A.
光检测器、光放大器、激光器
B.
半导体激光器、光检测器、发光二极管
C.
PIN 光电二极管、激光、荧光
D.
半导体激光器、半导体发光二极管
【判断题】启动子是RNA聚合酶结合的部位,不属于顺式作用元件
A.
正确
B.
错误
【简答题】水土流失的危害有哪些?
【简答题】水土流失的危害有哪些?
【简答题】水土流失的危害有哪些?
【简答题】什么是水土流失水土流失的危害有哪些?
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