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【多选题】
数字电路中最基本的逻辑关系有___。
A. 大于;
B. 小于;
C. 非;
D. 等于。
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答案
C
解析
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水的沸点是多少绝对温度___。
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B. 273.16;
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D. DEH。
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万用表在短期不使用的情况下应将___。
A. 电源关掉并将切换开关拨至电阻档;
B. 电源关掉并将切换开关拨至电流档;
C. 电源关掉并将切换开关拨至电压档。
【多选题】
微处理器的电路芯片主要组成包括___。
A. 算术逻辑部件;
B. 寄存器;
C. 控制器;
D. 内存。
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微型计算机基本组成___。
A. 总线;
B. 中央处理器;
C. 储存器;
D. 输入/输出接口。
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为什么工业自动化多采用直流信号___。
A. 仪表信号传输过程中,直流信号不受交流感应的影响,容易解决仪表的抗干扰问题;
B. 直流信号不受传输线路电感、电容的影响,不存在相位移问题,因而接线简单;
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温度测量常用元件有___。
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我厂没有用的液位计有___。
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我厂所用西门子雷达主要有___两种。
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下列___因素会导致误差的产生。
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下列测量元件可以远传的有___。
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下列测量元件中不是用于测量流量的是___。
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下列弹性膜片中不能用作弹性式压力表弹性元件的是___。
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下列对节流装置描述正确的是___。
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下列对四色环电阻描述正确的是___。
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下列关于控制器算法无法登录的原因及处理方法正确的是___
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下列关于热电阻的说法中正确的是___。
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下列信号属于非电量的是___。
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下列有关几个电阻并联的陈述中___是正确的。
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下列属于弹簧管压力组成的有___。
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下列属于设备组态的是___。
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下面属于物理层的设备是___。
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现场安装压力仪表应注意的主要问题___。
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现场控制站的保护接地包括___。
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现场控制站的技术特色包括___。
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现场控制站功能包括___。
A. 数据采集;
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选取压力表的测量范围时,被测压力不得小于所选量程的___。
A. 1/3;
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压力表在测量___介质时,一般在压力表前装隔离器。
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一般指示式仪表希望在___刻度下工作。
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