【填空题】
测量一个电路的电流,电流表必须和这个电路___。 串联
查看试卷,进入试卷练习
微信扫一扫,开始刷题
相关试题
【填空题】
差变原测量范围是0~10KpA,现调整使用负迁移量为10KpA,则测量范围变为___。 -10KpA~0KpA
【填空题】
差压流量计正压管线不畅,仪表指示偏___,负压管线不畅仪表指示偏___。 小,大
【填空题】
差压式流量计包括___、___、___三部分。 节流装置___,导压管,变送器___
【填空题】
差压式流量计在应用过程中,必须保证其测量在其设计量程的___以上。 三分之一
【填空题】
超声波不能在___中传播,所以超声波不能测量带有___或___的容器中的液位。 真空,真空,负压
【填空题】
程序控制系统由开关信号、___、___、___和执行机构组成。 输入回路,程序控制器,输出回路
【填空题】
存储器又可分为___和___两类。 ROM,RAM
【填空题】
大气压力:___。 常态下空气自重产生的压力
【填空题】
单位时间内流过的流体以体积表示的称为___,用___表示。 体积流量,Q,
【填空题】
当调节阀摩擦力大,需要精确定位的场合需要采用___。 阀门定位器
【填空题】
电磁流量计不能测量___、___、___、___和___。 气体,蒸汽,含有大量气泡的液体,石油及石油制品,不导电的有机溶液
【填空题】
电磁流量计的工作原理是以___为基础,产生___,转换器将电动势转换成标准的___模拟信号输出。 在线分析,电磁感应,感应电动势
【填空题】
电缆与测量管路成排作上下层敷设时,其间距不宜小于___mm。 200
【填空题】
调节阀的工作原理是:是根据物理学的___。 节流原理
【填空题】
调节阀前后压差较小,要求泄露量小,一般可选用___阀。 单座
【填空题】
定量给料机有两种标定方法:___、___。 实物标定,链码标定
【填空题】
对拔码开关的操作应在相应主控单元___情况下进行。 断电
【填空题】
对放射源进行检修维护时,___必须穿戴齐全,正确佩戴___。 辐射防护用品,个人剂量仪
【填空题】
对于粉仓、固态物料的测量我们最好使用___雷达。 调频连续波
【填空题】
对于系统中那些需要掉电保护和数据备份的重要数据,我们都用定义为___型变量。 保留
【填空题】
阀节门按其流量特性分为:___、___、___,其中___用开小流量调节。 线性,百分比,快开,百分比
【填空题】
放射源防护三要素为___、___、___。 时间,距离,屏蔽
【填空题】
放射源在检修维护其他非正常使用期,必须确保处于___状态。 关闭
【填空题】
分度号S、K、E三种热偶中,100℃时的电势分别为___、___、___。 0.645mv,4.095mv,6.317mv
【填空题】
服务器的下装文件包括___和___两个组成部分。 实时库,参数库
【填空题】
服务器每隔___分钟自动备份一个文件。 10
【填空题】
服务器算法中,常用的语言有SFC、___、___、___、___。 ST,FBD,LD,FM
【填空题】
服务器算法组态时,服务器负荷数据库点在AM类点声明时,站号为___。 0
【填空题】
浮筒式液位计基于___的工作原理。 阿基米德定律
【填空题】
根据变量有效范围,可以分为___、___。 局部变量,全局变量
【填空题】
根据欧姆定律可以看出,电阻元件是一个___元件。 耗能
【填空题】
构成A/D转换器的方法有:___、___、___、___、___。 计数式A/D转换,逐次逼近型A/D转换,双积分式A/D转换,并行A/D转换,串-并行A/D转换
【填空题】
管道连接的方法很多,常用的有___、___、___三种。 螺纹连接,法兰连接,焊接连接
【填空题】
国际标准模拟信号电压为___,电流为___。 1-5V,4-20MA
【填空题】
国家统一生产工业标准化热电阻有三种:___、___、___。 WZP型铂电阻,WZC型铜热电阻,WEN型镍热电阻
【填空题】
国内常用的调节阀填料有___和___两种。 石墨石棉,聚四氟乙烯
【填空题】
和指针式万用表相比,数字式万用表的优点是读数___,没有___,缺点是___。 准确,视差,反应慢
【填空题】
集散式控制系统又被称为___。 DCS
【填空题】
继电器的动作功率越小,其灵敏度越___。 高
推荐试题
【单选题】
The following statements are all true except .
A. A. Agribusinesses reflect the big, corporate nature of many farm enterprises.
B. B. Agribusinesses maintain a balanced trade pattern between agricultural imports and exports.
C. C. Agribusinesses range from one-family corporations to multinational firms.
D. D. Agribusinesses include a variety of farm businesses and structures.
【单选题】
About of American crops are for export.
A. A. half
B. B. one third
C. C. one fourth
D. D. one fifth
【单选题】
President Johnson tried to build a “Great Society” by introducing various programs like the following except .
A. A. Medicare
B. B. Food Stamps
C. C. Education Initiatives
D. D. Unemployment Pension
【单选题】
The following inventions took place during the “second indThe following inventions took place during the “second industrial revolution” except .
A. A. typewriter
B. B. telephone
C. C. electric light
D. D. refrigerator
【单选题】
The first National Bank of the United States was established with the urge of .
A. A. George Washington
B. B. Thomas Jefferson
C. C. Andrew Jackson
D. D. Alexander Hamilton
【单选题】
Chartered companies were NOT granted the by the British King or Queen.
A. A. political authority
B. B. economic rights
C. C. judicial authority
D. D. diplomatic authority
【单选题】
The modern American economy progressed from to , and eventually, to .
A. A. colonial economy, handcraft economy, industrial economy
B. B. farming economy, handcraft economy, industrial economy
C. C. colonial economy, farming economy, industrial economy
D. D. handcraft economy, farming economy, industrial economy
【单选题】
America produces a major portion of the world’s products in the following fields except .
A. A. machinery
B. B. automobiles
C. C. ore
D. D. chemicals
【单选题】
The President is directly voted into office by .
A. A. all citizens of America
B. B. the citizens over 18 years old
C. C. electors elected by the voters
D. D. the senators and representatives
【单选题】
The Supreme Court is composed of justices.
A. A. six
B. B. seven
C. C. eight
D. D. nine
【单选题】
The terms for a Senator and Representative are and years respectively.
A. A. two, four
B. B. two, three
C. C. two, six
D. D. six, two
【单选题】
According to the Constitution, a candidate for President must be .
A. A. at least 35 years old
B. B. at least a 14 years’ resident of the United States
C. C. born in America
D. D. all of the above
【单选题】
The following except are all powers of the President.
A. A. vetoing any bills passed by Congress
B. B. appointing federal judges when vacancies occur
C. C. making laws
D. D. issuing executive orders
【单选题】
All the following except cannot make legislative proposal.
A. A. the Senator
B. B. the Representative
C. C. the Secretary of State
D. D. the President
【单选题】
The following except are guaranteed in the Bill of Rights.
A. A. freedom of religion
B. B. the right to get into people’s house by police
C. C. freedom of speech and of press
D. D. the right to own one’s weapon if one wishes
【单选题】
The Bill of Rights .
A. A. defines the rights of Congress and the rights of the President
B. B. guarantees citizens of the United States specific individual rights and freedoms
C. C. is part of the Declaration of Independence
D. D. has no relationship with the Constitution
【单选题】
The Constitution of the United States .
A. A. gives the most power to Congress
B. B. gives the most power to the President
C. C. tries to give each branch enough power to balance the others
D. D. gives the most power to the Supreme Court
【单选题】
The U. S. Constitution came into effect in .
A. A. 1787
B. B. 1789
C. C. 1791
D. D. 1793
【单选题】
The Vietnam War was a long-time suffering for Americans, and it continued throughout the terms of Presidents .
A. A. Johnson, Nixon and Ford
B. B. Truman, Eisenhower and Kennedy
C. C. Kennedy, Johnson and Nixon
D. D. Eisenhower, Kennedy and Johnson
【单选题】
President applied New Deal to deal with the problems of the Great Depression.
A. A. Wilson
B. B. Truman
C. C. Roosevelt
D. D. Kennedy
【单选题】
The policy of the United States was at the beginning of the two world wars.
A. A. neutrality
B. B. full involvement
C. C. partial involvement
D. D. appeasement
【单选题】
Abraham Lincoln issued to grant freedom to all slaves.
A. A. Declaration of Independence
B. B. Constitution
C. C. Emancipation Proclamation
D. D. Bill of Rights
【单选题】
In May 1775, was held in Philadelphia and began to assume the functions of a national government.
A. A. the First Continental Congress
B. B. the Second Continental Congress
C. C. the Boston Tea Party
D. D. the Congress of Confederation
【单选题】
The first shots of the American dependence were fired in .
A. A. Concord
B. B. Lexington
C. C. Philadelphia
D. D. Boston
【单选题】
“No taxation without representation” was the rallying slogan of .
A. A. the settlers of Virginia
B. B. the people of Pennsylvania
C. C. the colonists in New England
D. D. the people of the 13 colonies
【单选题】
The Seven Years’ War occurred between the .
A. A. French and American Indians
B. B. French and Spaniards
C. C. French and British
D. D. British and American Indians
【单选题】
Pilgrim Fathers are a group of who came to America to avoid persecution in England.
A. A. Protestants
B. B. Puritans
C. C. Catholics
D. D. Christians
【单选题】
The first successful English colony in North America was founded at in .
A. A. Jamestown, Louisiana
B. B. Boston, Massachusetts
C. C. Jamestown, Virginia
D. D. Plymouth, Georgia
【单选题】
The characteristic of dominant American culture is .
A. A. English-speaking, northern European, Roman Catholic and middle-class
B. B. English-speaking, western European, Roman Catholic and upper-class
C. C. English-speaking, northern European, Protestant and upper-class
D. D. English-speaking, western European, Protestant and middle-class
【单选题】
The ImmiWar of Ingrants Act of 1924 restricted the further immigration into the United States, particularly from .
A. A. Europe
B. B. Asia
C. C. Africa
D. D. South America
【单选题】
The largest minority in the United States is the .
A. A. Pacific Islanders
B. B. Blacks
C. C. Native Americans
D. D. Asians
【单选题】
The native Alaskan population includes the following except the .
A. A. Indians
B. B. Eskimos
C. C. Aleuts
D. D. Blacks
【单选题】
is located on the U. S. –Canadian border between Lake Erie and Lake Ontario.
A. A. Yellowstone National Park
B. B. The Grand Canyon
C. C. Niagara Falls
D. D. The Great Salt Lake
【单选题】
Some of the world famous universities like Harvard, Yale and MIT are located .
A. A. in the South
B. B. along the Pacific Coast
C. C. in New England
D. D. in the Midwest
【单选题】
The largest river in the U. S. is .
A. A. the Missouri River
B. B. the Mississippi River
C. C. the Ohio River
D. D. the Colorado River
【单选题】
The U. S. lies in North America, with Canada to the north, Mexico to the south, the Atlantic to its and the Pacific to its .
A. A. northern, east, west
B. B. central, east, west
C. C. southern, west, east
D. D. western, east, west
【单选题】
The state of is the largest in area of all the states.
A. A. Alaska
B. B. Hawaii
C. C. Texas
D. D. Florid
【单选题】
The United States has states on the continent.
A. A. 50
B. B. 49
C. C. 48
D. D. 35
【单选题】
Waiting for Godot is written by .
A. A. Samuel Beckett
B. B. George Orwell
C. C. William Golding
D. D. D. H. Lawrence
【单选题】
Of the following writers, is NOT a Nobel Prize winner.
A. A. Samuel Beckett
B. B. James Joyce
C. C. William Golding
D. D. V. S. Naipaul