[单选题]体系经过一绝热可逆过程,其熵的变化为( ). A.>0B.<0C.=0D.都有可能
[单选题]关于集线器,以下哪些说法是错误的()A、网络中的计算机共享带宽,不安全.B、使用集线器联网的计算机在一个冲突域中.C、接入集线器的设备需要有MAC地址,集线器基于帧的MAC地址转发.D、使用CSMA/CD协议进行通信,每个接口带宽相同.
[计算题]已知某挡土墙高5 m,墙背竖直、光滑,墙后填土面水平,填土的物理力学性质指标如图所示.试计算作用在该挡土墙墙背上的主动土压力合力及其作用点位置._____ _____________ | / |γ=18.0kN/m^3 | / |ψ=20° | / |c=12.0kPa | / | | / |――――――――――――
[判断题]最惠国待遇就是给予贸易对方最优惠的贸易条件.
[判断题]“炉”即是燃烧系统,其主要任务是使燃料在炉内良好燃烧放出热量,它是由炉膛、燃烧器、点火装置、空气预热器等组成
[判断题]李商隐是晚唐诗歌成就最高的作家. ( )
[单选题]can you ga to the concert wuth us this evening
[填空题]Strings1=“China”;intn=s1.length( );n的值为___
[问答题]试述风力发电机组手动启动和停机的操作方式有哪些
[单选题]“会计电算化”一词是在 1981年( )会上提出的.A. 北京B. 上海C. 长春D. 广州
[判断题]汽轮机设计所依据的各种参数值称为设计值,
[判断题]计算高温级管式空气预热器时不需考虑烟气辐射.
[单选题]在以下关于除尘器电晕电场中的粒子荷电机理的论述中,错误的是( ).A. 直径dP>0.5μm的粒子以电场荷电为主.B. 直径dP<0.2μm的粒子以扩散荷电为主.C. 电场荷电过程的粒子荷电量与电晕电场的温度成正比.D. 扩散荷电过程的粒子荷电量与电晕电场的温度成正比.
[单选题]KTV包房专为家庭或少数亲朋好友自唱自娱之用,一般采用以( )为主的装饰材料.A.墙纸B.涂料C.板材D.织物
[单选题]评点属于阅读策略中的 A.认知语言策略B.还原语境策略C.收集和处理信息策略D.精细加工策略
[单选题]婴儿开始添加淀粉类食物的月龄是( )A、2个月 B、3个月 C、4个月 D、5个月
[单选题]对以下音、视频设备描述不正确的是______. A、 媒体播放器只能播放视频文件 B、 常见的音频播放软件有RealPlayer、Winamp C、 Audition、GoldWave 属专业音频处理软件 D、 媒体播放器既可以播放音频文件,也可以播放视频文件
[阅读理解]A rich American went into a shop in London. He wanted very much ___1___ a nice-looking watch. He saw a watch and liked it so much that he decided to buy it. But the owner of the shop asked five hundred dollars for it.While the American was hesitating, a young man suddenly came into the shop, took the watch out of the owner.s hand and ran out with it. It all happened in ___2___ seconds. When the owner ran out into the street, the young man had already ___3___ among the people. The American went on. At the next corner, he saw the young man with the stolen watch in his hand, Do you want to buy a fine watch, sir? he said in a low voice, It.s only a hundred dollars. The young man doesn.t know I saw him ___4___ the watch just now, he thought. The American paid at once and went happily back to his room with the watch. He told his friend about the fine watch. His friend ___5___ a look at the watch and started to shout immediately. He said, You are a fool. This watch is worth only ten dollars. I.m sure the shop owner and the young man planned all this together.1.A:a few B:disappeared C:to get D:took E:stealing2.A:a few B:disappeared C:to get D:took E:stealing3.A:a few B:disappeared C:to get D:took E:stealing4.A:a few B:disappeared C:to get D:took E:stealing5.A:a few B:disappeared C:to get D:took E:stealing
[单选题]在换路瞬间,下列说法正确的是( ).A.电感电流不能跃变 B.电感电压必然跃变C.电容电流必然跃变 D.以上说法都不对
[填空题]对于产品种类较多的企业宜采用
[名词解释]施工总进度计划