围场境内有四条主要河流分别属于滦河和辽河水系，其中注入辽河的河流是（ ） A．伊 发布时间：2017-06-20 23:49 │ 来源：www.tikuol.com 题型：选择题 问题： 围场境内有四条主要河流分别属于滦河和辽河水系，其中注入辽河的河流是（ ）A．伊逊河B．伊马吐河C．小滦河D．阴河
题型：选择题 完形填空。 Having lived in the house for so long, we found our kitchen looked old. We decided it was time to 1 the kitchen, and my husband and I were discussing 2 colors. The children, sitting nearby, suddenly all spoke together: "Not the measuring stick." "No," I 3 them. "Not the measuring stick." The measuring stick isn't a (an) 4 stick but the kitchen side of the door between our kitchen and dining room. Along the edge we've 5 each child's growth by making a mark showing his or her 6 on every birthday. Over the years so many colored pens, pencils and markers have been used, that now, this white door is somewhat like an abstract painting. Names and dates show different 7 , and I can tell by the script (手迹) who measured whom. An eight-year-old measured her three-year-old sister, a grandchild measured her grandmother, and my husband measured me. At the parties, when this door 8 back and forth frequently, friends stop to 9 the names and dates. When we ask if they would like to be always remembered, they usually smile 10 and go back right up into place, 11 to be measured. Many of those listed on the door are still 12 ; some have stopped. Some remain with us only in 13 . When my mother came to see my eldest daughter graduate from university, we measured her too. It was her last visit to our home. We haven't 14 the new kitchen color plan yet, but one thing is certain: whatever color we choose, the back of the ki( )1. A. restore ( )2. A. comfortable ( )3. A. promised ( )4. A. false ( )5. A. kept ( )6. A. age ( )7. A. information ( )8. A. adjusts ( )9. A. copy ( )10. A. proudly ( )11. A. ready ( )12. A. growing ( )13. A. sight ( )14. A. concerned about( )15. A. fresh B. rebuild B. possible B. repeated B. wonderful B. witnessed B. weight B. handwriting B. shuts B. read B. automaticallyB. voluntary B. contributing B. design B. approved of B. old C. sell C. available C. followed C. actual C. recorded C. name C. style C. opens C. appreciateC. shyly C. able C. studying C. amazement C. decided onC. white D. repaint D. changeable D. responded D. obvious D. accompanied D. height D. characteristic D. swings D. remove D. calmly D. unwilling D. working D. memory D. relied on D. original 查看答案
题型：选择题 在一个单CPU的计算机系统中，有两台外部设备R1、R2和三个进程P1、P2、P3。系统采用可剥夺方式优先级的进程调度方案，且所有进程可以并行使用I/O设备，三个进程的优先级、使用设备的先后顺序和占用设备时间如表5-4所示。表5-4 设备的先后顺序和占用设备时间进程优先级使用设备的先后顺序和占用设备时间Ｐ1高R2(30ms)→CPU(10ms)→R1(30ms)→CPU(10ms)Ｐ2中R1(20ms)→CPU(30ms)→R2(40ms)Ｐ3低CPU→R1(10ms) 假设操作系统的开销忽略不计，三个进程从投入运行到全部完成，CPU的利用率约为（15）%；R2的利用率约为（16）%(设备的利用率指该设备的使用时间与进程组全部完成所占用时间的比率)。15（）A．60B．67C．78D．90 查看答案