出自:西安石油大学-大学英语2

40. Farmers will have a good harvest, _______ that the weather is favorable. A) assuming B) resuming C) predicting D) expecting
Be yourself. Many how-to books advise you to stride into a room and impress others__41__your qualities. They__42__ you to greet them with “power handshakes” and tell you to fix your eyes on the other person. If you __43__ all this advice, you’ll __44__ everyone crazy—including yourself. The __45__ is to be consistently you, __46__ your best. The most __47__ people never change from one situation to another. They are the same __48__ they are having a conversation or being interviewed for a job. They communicate with their whole being; the tones of their voices and their gestures __49__ their words. Public speakers, however, often send __50__ messages. My favorite is the kind who say, “Ladies and gentlemen. I’m very happy to be here” – while looking at their shoes. They don’t look happy. They look angry, frightened or depressed.
IV. Banked Cloze (1*10=10 points) Directions: Fill in the blanks in the following passage by selecting suitable words from the Word Bank. You must not use any of the words more than once Word Bank A. Assets I. joining B. Attend J. naturally C. Aware K. observe D. especially L. origin E. Excellent M. recruited F. Expensive N. up-to-date G. guidelines O. volunteering H. involved As a teacher, you could bring the community into your classroom in many ways. The parents and grandparents of your students are resources and 51 for their children. They can be 52 teachers of their own traditions and histories. Immigrant parents could talk about their country of 53 and why they emigrated to the United States. Parents can be invited to talk about their jobs or a community project. Parents, of course, are not the only community resources. Employees at local businesses and staff at community agencies have 54 information to share in classrooms. Field trips provide another opportunity to know the community. Many students don.t have the opportunity to 55 concerts or visit museums or historical sites except through field trips. A school district should have 56 for selecting and conducting field trips. Families must be made 57 of field trips and give permission for their children to participate. Through school projects, students can learn to be 58 in community projects ranging from planting trees to cleaning up a park to assisting elderly people. Students, 59 older ones, might conduct research on a community need that could lead to action by a city council or state government. Some schools require students to provide community service by 60 in a nursing home, child care center or government agency. These projects help students understand their responsibility to the larger community.
61. 媒体比如电视、网络、报纸等在人们的生活中起到越来越重要的作用。(play a role)
62. 既然我们已经学完这门课程,就应该多做些复习。(now that)
63. 桑迪如此喜欢摇滚音乐以至不顾父亲的反对而将音量放大。(appeal to)
64. 周教授一生都致力于语言教学事业。(be committed to)
65. 对此事我记忆犹新,就像昨天发生的一样。(as though)
1.椭圆齿轮流量计的体积流量计算公式是( )。 A. Q = 3nV0 B. Q =2 nV0 C. Q =4 nV0 D. Q = nV0
下列流量计中哪一个最适合小流量、小管经的流量测量?( ) A. 差压流量计 B. 转子流量计 C. 椭齿流量计 D. 漩涡流量计
K是反映对象( )的参数,希望干扰通道的K( )。 A. 动态特性 B. 小一点 C. 静态特性 D. 大一点
判断下图为调节系统在阶跃干扰作用下的过渡形式( )。 A. 衰减振荡过程 B. 非周期衰减过程 C. 等幅振荡过程 D. 发散振荡过程
5.被测介质为具有腐蚀性的流动液体压力测量时,需安装加有中性介质的隔离罐,设被测介质密度大于隔离液密度,判断下图中的哪一个为正确取压方案?( ) A. a图 B. b图 C. c图 D. d图
6.控制系统中,调节器的比例度越小,则( )。( 多选题 ) A. 余差越小 B. 过渡过程越平缓 C. 可能发散振荡 D. 余差越大 E. 过渡过程振荡越激烈
7.调节阀的理想流量特性有( )。( 多选题 ) A. 直线型 B. Y 型 C. 等百分比型 D. x型 E. 快开型
8.下列常用控制规律中哪几个属于有差控制?( )(多选题) A. P B.PI C.PD D.PID
1.描述对象特性的参数有 。
2.确定最合适的P、I、D,对于单回路的简单控制系统,一般希望过渡过程的衰减比数值为 的衰减振荡过程。
3.热电阻测温时,采用三线制的连线方法的目的是 。
4.控制流程图中某仪表字母代号为FRC-103代表 。
阀阻比S= ,当S=1时 与 一致。
广义对象包括 。
控制器设纯比例规律时,应设Ti= Td= 。
反馈控制系统检测的是 量; 前馈控制系统检测的是 量。
DDZ-Ⅲ电动仪表的标准输入信号范围为 。 气动仪表的标准输入信号范围为 。
控制器参数整定的任务是什么?工程上常用的控制器参数整定有哪几种方法。(3分)
.电-气阀门定位气的作用是什么(
某台往复式压缩机的出口压力范围为25~28 MPa,测量误差不得大于1 MPa,工艺上要求就地观察,并能实现高低限报警,若选用 YX-150型电接点压力表,测量范围为0~60Mpa,精度等级为1.5级。试确定该仪表的上下限值、精度等级是否符合要求。(6分)
1.控制系统的过渡过程品质指标中,余差表示( )。 A. 调节参数与被调参数之差 B. 测量值与给定值之差 C. 新稳态值与给定值之差 D. 超调量与给定值之差
2.对象特性参数T是反映对象( )的参数。通常希望控制通道的T( )。 A. 小一点 B. 动态特性 C. 静态特性 D. 大一点
3.判断下图为调节系统在阶跃干扰作用下的过渡形式( )。 A.非周期衰减过程 B.衰减振荡过程 C.等幅振荡过程 D.发散振荡过程
4.下列流量计哪一个不能用于测量导电率小于自来水的介质( )。 A.差压流量计 B.电磁流量计 C.椭齿流量计 D.漩涡流量计
5.已知一个对象特性的一阶微分方程为: 判断T为( )。 A. 6 B. 10 C. 1 D. 0
6.控制系统中,调节器的积分时间越小,则( )。( 多选题 ) A. 余差越小 B. 积分作用越弱 C. 积分作用越强 D. 余差越大 E. 过渡过程振荡越激烈
7.下列常用控制规律中哪几个属于有差控制( )(多选题) A. P; B.PI; C. PD; D. PID
8. 确定最合适的P、I、D参数,对于单回路的简单控制系统,以下哪些在希望的过渡过程中( )(多选题) A. 7:1 B. 9:1 C. 12:1 D.50:1 E. 5:1
1.工业热电偶应用时使用补偿导线的目的是 。
常用热电偶分度号有 热电偶输出是 值。
.DDZ-Ⅲ电动仪表的标准输入信号范围为 。 气动仪表的标准输入信号范围为 。
一种前馈控制系统能克服 种干扰;反馈控制系统能克服 干扰。
描述对象特性的参数有 ,被调参数达到新稳态值的 所需的时间就是时间常数 T。
8. 流量计最适合测量小流量。 流量计用于测量粘度较大的介质。
最常见的操纵变量是 ,另外也有 作为操纵变量。
控制流程图中仪表字母代号分别为PI-307、TRC-201说明所代表的意义。
何为无扰动切换。
设有一台精度等级为 0.5 级的电子电位差计,量程为0~1000℃,在正常情况下进行检验,测得的最大绝对误差为+6℃ ,问该电子电位差计是否合格?