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填空。 Once, in a small village, lived a family with eight children. Two of the children loved 1 very much, but the family was so poor that it was impossible to send 2 of them to study at the art college at the same time. After many discussions, the two boys finally 3 a plan. They would toss (抛) a coin. The loser would 4 down into the mines (煤矿) and, with his earnings (赚得的钱), 5 his brother studying at the college. Then, when the brother who won the toss finished his studies, after four years, he would support 6 brother studying at the college. James won the toss and Jack went down into the mines. James worked with all his heart and his paintings were much 7 than those of most of his teachers, and by the time he 8 , he was beginning to make a lot of money for his paintings. 9 James returned, the family held a big dinner for his great success. Soon after the meal began, James 10 up from his seat to drink a toast to his dear 11 . He said, 'Jack, now you can go to the art college and your 12 will come true. I will take care of you.' But Jack said 13 , 'Brother, the four years in the mines has done too much to my hands, so it' s too 14 . Now I can' t even hold a glass.' To show his great love and respect, James drew his brother' s hands with 15 towards the sky. He called his drawing 'The Praying Hands', which became very famous years later. (     )1. A. painting (     )2. A. any (     )3. A. looked out (     )4. A. run (     )5. A. support (     )6. A. other (     )7. A. better (     )8. A. arrived (     )9. A. Before (     )10. A. picked (     )11. A. brother (     )12. A. way (     )13. A. happily (     )14. A. early (     )15. A. legs B. books B. all B. worked out B. jump B. agree B. another B. worse B. graduated B. When B. turned B. sister B. idea B. surprisedly B. late B. feet C. school C. both C. took out C. come C. follow C. the other C. cheaper C. walked C. Though C. looked C. father C. dream C. angrily C. good C. arms D. money D. neither D. got out D. go D. let D. others D. older D. waited D. While D. stood D. mother D. practice D. softly D. helpful D. fingers
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【简答题】半导体中有#tk#和空穴两种载流子参与导电,其中空穴带正电,而自由电子带负电。
【单选题】N 型半导体中的自由电子数量多,空穴数量少,参与导电的主要是?
A.
带负电的空穴。
B.
带正电的空穴。
C.
带负电的自由电子。
D.
带正电的自由电子。
【简答题】半导体中有 自由电子 和 空穴 两种载流子参与导电,其中____带正电,而____带负电。
【简答题】杂质半导体中有 自由电子 和 空穴 两种载流子参与导电,其中 带正电,而 带负电。
【简答题】计算: 1. lg4+lg25 2. lg80-lg8
【单选题】lg4+lg25=
A.
1
B.
2
C.
3
D.
4
【判断题】流通企业可以通过建立物流分公司,提高物流效率,降低物流成本。
A.
正确
B.
错误
【简答题】lg25 + lg4=
【简答题】半导体中有 和 两种载流子参与导电,其中 空穴 带正电,而 自由电子 带负电。
【简答题】半导体中有空穴和自由电子两种载流子参与导电,其中( )带正电,而( )带负电。
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