一般电除尘多为负电晕，其收尘效率高，可到98%~99%，改为正电时效率只有（）左右。 发布时间：2019-07-05 17:46 │ 来源：www.tikuol.com 题型：单项选择题 问题： 一般电除尘多为负电晕，其收尘效率高，可到98%~99%，改为正电时效率只有（）左右。A.70%B.80%C.90%D.85%
题型：单项选择题 完形填空。 Life is not easy, so I'd like to say "When anything happens, believe in yourself." WhenI was a young boy, I was 1 shy to talk to anyone. My classmates often 2 me. I wassad but could do nothing. Later, 3 happened, and it changed my life. It was an English speech contest. My mother asked me to 4 it. What a terrible idea! It meant I had to speak before all the teachers and students of my school. "Come on, boy. Believe in yourself. You are sure to 5 the contest." Then mother andI talked about many different topics. At last I chose the topic "Believe in yourself." I tried my best to remember all the speech and practiced it over 100 6 . With my mother's great love, I did 7 in the contest. I could hardly believe my ears when the news came that I had won the first place, I heard the cheers 8 the teachers and the students. Those classmates 9 once looked down on (看不起) me, now all said "Congratulations!" to me. My mother hugged me and cried excitedly. Since then, everything has changed for me. When I do anything, I try to tell 10 to be sure and I will find myself. This is not only for a person but also for a country. ( )1. A.too ( )2. A.made faces at( )3. A.nothing ( )4. A.take part in ( )5. A.lose ( )6. A.words ( )7. A.well ( )8. A.for ( )9. A.when ( )10. A.someone B.so B.looked afterB.something B.join B.win B.topics B.good B.at B.what B.me C.quite C.caught up with C.everything C.get C.pass C.times C.bad C.from C.which C.everything D.very D.laughed at D.anything D.make D.beat D.sentences D.interested D.to D.who D.myself 查看答案
题型：单项选择题 在临床放射治疗计划中关于等效生物剂量的考虑，下面说法不正确的是（）。A.在进行等效生物剂量换算时，要根据肿瘤本身的生物学规律选择合适的数学模型B.改变常规治疗计划时应该保持相等生物效应所需的总剂量C.当放疗不良反应导致治疗中断时间较长，要根据肿瘤生物学规律重新评价生物效应剂量D.当放疗不良反应导致治疗中断时间较长，仍可按照原计划进行E.不同阶段放射治疗等效生物剂量可以直接相加 查看答案
题型：单项选择题 肝性脑病的氨代谢，下述哪项不正确（）A.大多数门腔分流术患者血液及脑脊液中氨含量都增高B.暴发性肝功能衰竭所致脑病血氨往往更高C.动脉血和脑脊液中氨含量明显相关D.便秘时会引起血氨增高E.结肠呈碱性环境时产氨增多 查看答案