磺胺类药物作用机制是与细菌竞争（） A.二氢叶酸还原酶 B.二氢叶酸合成酶 C.四氢 发布时间：2017-08-31 04:53 │ 来源：www.tikuol.com 题型：单项选择题 问题： 磺胺类药物作用机制是与细菌竞争（）A.二氢叶酸还原酶B.二氢叶酸合成酶C.四氢叶酸还原酶D.一碳单位转移酶E.叶酸还原酶
题型：单项选择题 完形填空。 Who Is Cleverer, the Son or the Father? Mr Clarke works in a middle school. He likes reading and often 1 some books from the library. He keeps 2 to the radio every morning and reading 3 after supper. So he knows much and teaches well. His 4 worship (崇拜) him very much. Mike, Mr Clarke's little son, is only nine. He 5 likes reading books. And he often asks his father some questions. Mr Clarke always thinks he's too 6 to understand him and chooses the easiest ones 7 . Of course the boy is not happy with (对……满意) it. One day Mike read 8 about the electric lights (电灯) and was 9 it. When his father told him to do some housework, he was on thinking of it. He asked him 10 questions, and his father answered all. Then his father said proudly (自豪地), "Fathers always know more than sons!" The boy thought 11 a while (一会儿) and said, " 12 !" "Oh? Why?" Mike didn't answer 13 asked instead (反而), "Who invented (发明) the electric lights?" " 14 " answered Mr Clarke. "Why didn't his father invent them, then?" Looking at his son, Mr Clarke didn't know 15 to answer! ( ) 1. A. finds ( ) 2. A. watching ( ) 3. A. newspapers ( ) 4. A. teachers ( ) 5. A. also ( ) 6. A. old ( ) 7. A. answer ( ) 8. A. everything ( ) 9. A. worried about( ) 10. A. few ( ) 11. A. of ( ) 12. A. So do I ( ) 13. A. but ( ) 14. A. Thomas Brown ( ) 15. A. when B. sells B. listening B. letters B. parents B. never B. young B. answering B. nothing B. interested inB. little B. about B. Neither am I B. and B. Allan Smith B. what C. buys C. going C. stories C. students C. ever C. clever C. answered C. something C. afraid of C. a few C. for C. I agree C. then C. Thomas Edison C. where D. borrows D. touching D. messages D. classmates D. only D. able D. to answer D. anything D. angry with D. a little D. at D. I don't think so D. or D. Ron Jenkins D. while 查看答案
题型：单项选择题 下列关于线程的叙述中，正确的是A．每一个线程可以有多个标识符和其相应的线程描述表B．不同的线程可以执行相同的程序C．同一进程中的各个线程共享该进程的逻辑地址空间D．多个线程不可以并发执行的 查看答案