[多选题]一个同步时序逻辑电路不可用( )三组函数表达式描述A.最小项之和、最大项之积和最简与或式B.逻辑图、真值表和逻辑式C.输出方程、驱动方程和状态方程D.输出方程、特性方程和状态方程
[阅读理解]In our online life,we need to use passwords frequently.We use passwords 21 e-mail, gaming sites,social networking sites,and other shopping sites.22 the passwords most people use are not very 23 and can easily bebrokenby others.In fact,the most commonly used passwords are so simple that it requires very 24 effort to figure them out.Can you guess 25 the most commonly used passwords are They are:Names of baseball teams,birth dates of a family 26 the year of a special sports event,the random numbers like 156468, 27 the name of a friend,pet,favorite TV star,or band.There are programs28 to break into people.s online accounts.These programs are29of trying every word in the English dictionary and the dictionaries 30 many foreign languages,in their effort to break into an account. 31 can even search words backward.Some will try 32 words or words that are followed by numbers,school222.These programs can test millions of passwords in a few minutes.So,you are advised to be careful about 34 passwords so that they will be hard to break.You are also advised not to make 35 hard to remember.Meanwhile,you need to change them once in a while.21.A.to B.withC.byD. for22.A.HoweverB.ThereforeC.MoreoverD.Besides23.A.naturalB.safeC.strangeD.clear24.A.minorB.smallC.littleD.tiny25.A. whatB.whoC.whereD.which26.A.figureB.memberC.creatureD. character27.A.as close asB.as goodC.as dear asD.as well as28.A.formedB.shapedC. composedD.designed29.A. typicalB.capableC.sureD.true30.A.fromB.withC.ofD. for31.A.TheyB.ItC.ThatD.Those32.A.addedB.gatheredC. combinedD. collected33.A.suchB. except forC.as forD.as of34.A.locatingB. searchingC. choosingD.tracking35.A.ratherB. tooC. farD.enough
[单选题]投资回收期和借款偿还期两个经济评价指标都是( ).A.自建设年开始计算B.时间性指标C.反映偿债能力的指标D.动态评价指标
[多选题]功率放大器的主要技术指标有A.最大输出功率B.电流放大倍数C.电压放大倍数D.集电极转换效率
[多选题]不属于组合逻辑电路的部件是( )A.编码器B.寄存器C.触发器D.计数器
[单选题]下列是真命题的是( )A.2是素数B.2+3=6C.雪是黑色的D.3能被2整除
[填空题]( )是整个施工准备工作的核心,是工程设计和施工之间的桥梁
[单选题]跨国购并按双方所处的行业关系,可分为( ).A.纵向购并、横向购并、混合购并B.现金购并、股票购并C.同行业购并、跨行业购并D.股权购并、非股权购并
[单选题]以“小、灵、便”为特征的连锁店是( ).A.便利店B.百货商店C.购物中心D.大型超级市场
[单选题]预防和鉴定成本被认为是 ( )A.投入B.损失C.使用价值D.间接质量成本
[判断题]特殊情况下,倒闸操作可由一人按照操作票执行,不需要监护或监控.( )
[多选题]电气设备按其电压等级分为哪两种A.低压电气设备B.中压电气设备C.高压电气设备D.超高压电气设备
[单选题]设G是一棵树,则G 的生成树有( )棵.A.0B.1C.2D.不能确定
[单选题]我国地方政府对终生只生育1个孩子的工作妇女,规定假期可延长到 ( )A.90~180天B.180~360天C.180~270天D.90天~150天
[单选题]绕线式感应电动机转子回路串电阻起动时,其特点为:A.Ist ↑, Tst ↓B.Ist ↑, Tst ↑C.Ist ↓, Tst ↑D.Ist ↓, Tst ↓
[计算题]A, B为两个任意集合,求证:A-(A∩B) = (A∪B)-B .
[单选题]蓄电池所能输出的能量与它的极板表面积( ).A.没有关系B.成反比C.成正比.D.不定
[填空题]差动保护按其装置方式的不同可分为
[问答题]对继电器有哪些要求
[问答题]写出Python运算符&的两种功能
[问答题]三段式零序电流保护由哪些保护组成