按《压力容器安全技术监察规程》分类时，属于二类容器的设备有（）。A．剧毒介质的低压容 发布时间：2018-01-11 07:54 │ 来源：www.tikuol.com 题型：多项选择题 问题： 按《压力容器安全技术监察规程》分类时，属于二类容器的设备有（）。A．剧毒介质的低压容器B．易燃或有毒介质的低压分离器C．易燃或有毒介质的低压反应器外壳或储罐D．低压管壳式余热锅炉
题型：多项选择题 X线照片影像锐利度的叙述，正确的是A．两部分影像密度的转变是逐渐的还是明确的程度B．锐利度为：S=H/(D1-D2)C．两密度移行幅度越大，其边缘越模糊D．照片的锐利度与模糊值成反比E．对比度增加，锐利度好 查看答案
题型：多项选择题 完形填空。 The year I went away to college was a very difficult transition (过渡期) for me. 1 is probably true withmany people. I got quite homesick and 2 thought about going home. Although the 3 time for many students is getting 4 from home, my mailbox was frequently 5 . Oneday when I went to the mailbox, there was a postcard 6 out at me. I sat down to read it, 7 a note fromsomeone back home. 8 I became increasingly puzzled (困惑) as 9 postcards were like this; It was a fullnews report about a woman named Mabel and her newborn baby. I took the card back to my room and 10 about it. Several days later I 11 another postcard, this one 12 news about Maybelline, Mabel's cousin. Soon after, another card arrived and then another, 13 full of news of different people. I began to 14 look forward tothe next one, 15 to see what this author would come up with 16 . I was never 17 . Finally, the cards 18 coming, right about the time I had begun to feel 19 about college life. They had been such a happy distraction (调剂) that I have 20 all the postcards and still bring them out to read whenever I need a lift. ( )1. A. If ( )2. A. often ( )3. A. hard ( )4. A. visitors ( )5. A. empty ( )6. A. pouring ( )7. A. describing ( )8. A. But ( )9. A. any ( )10. A. joked ( )11. A. mailed ( )12. A. delivering( )13. A. one ( )14. A. nearly ( )15. A. promising ( )16. A. below ( )17. A. frightened( )18. A. continued ( )19. A. easy ( )20. A. lost B. So B. carefully B. last B. letters B. full B. reaching B. considering B. Thus B. no B. talked B. accepted B. demanding B. each B. possibly B. surprised B. lately B. disappointed B. stopped B. safe B. collected C. As C. seldom C. busiest C. calls C. closed C. staring C. enjoying C. Also C. some C. forgot C. wrote C. discoveringC. either C. usually C. interested C. next C. excited C. started C. tired C. torn D. What D. merely D. happiest D. directions D. open D. rolling D. expecting D. Even D. such D. cared D. received D. developing D. both D. really D. pretending D. behind D. pleased D. avoided D. anxious D. saved 查看答案