相关试题
【单选题】
理论制冷循环中,制冷压缩机吸入的是___蒸气
A. 高温
B. 湿饱和
C. 干饱和
D. 过热
【单选题】
在蒸发器中,制冷剂液体在___温度下沸腾转变为蒸气
【单选题】
随着___蒸气在蒸发器内流动与吸热,制冷剂逐渐蒸发为蒸气
【单选题】
制冷剂在蒸发器内蒸发温度与蒸发___相对应,即蒸发压力升高,其蒸发温度也跟着升高
【单选题】
制冷剂蒸气进入冷凝器,其自身因受冷却凝结为___
【单选题】
节流过程是一个___变化过程
A. 气液
B. 冷热
C. 压力
D. 热力状态
【单选题】
节流元件的作用是将高温高压液体变为低温低压的___
【单选题】
当高压流体通过小孔时,由于摩擦增加,静压下降,使流体达到___调节流量的目的
【单选题】
热力膨胀阀是利用蒸发器出口制冷剂的___自动调节供给蒸发器内制冷剂流量的节流阀
A. 过冷度
B. 过热度
C. 温度
D. 湿度
【单选题】
当流体在毛细管内流动时,由于管道摩擦阻力而产生___
【单选题】
毛细管管径越小或管子越长,则流动的___就越大
【单选题】
当高压制冷剂液体进入毛细管后,其___会突然剧增
【单选题】
使用毛细管节流的制冷系统不需要___,因而充入的制冷剂数量较少
A. 蒸发器
B. 冷凝器
C. 贮液器
D. 汽液分离器
【单选题】
汽液分离器是防止___制冷剂直接进入压缩机的装置
A. 过量
B. 气体
C. 液体
D. 气液混合物
【单选题】
YZ25K型客车照明控制箱中自动空气开关(三联)Q的型号是___
A. D45N-3P
B. C45N-3P
C. C40N-3A
D. C40N-3P
【单选题】
YZ25K型客车照明控制箱电气原理图中字母代号为___的电气元件表示交流接触器
【单选题】
YZ25K型客车照明控制箱电气原理图中字母代号为___的电气元件表示熔断器
【单选题】
25K型客车车内的负载按电压可分三种:___、单相220 V交流负载、三相380 V交流对称负载
A. DC 48 V直流负载
B. DC 110 V直流负载
C. AC 110 V交流负载
D. AC 48 V交流负载
【单选题】
空调机组的动力干线由___引出
A. 空调控制柜
B. 电源控制柜
C. 应急电源箱
D. 电源主干线
【单选题】
25T型客车在A2级修程落成后,满负载运行1 h试验,同一电器三相接线处温度差不得高于 ___正确答案:
A. 20 ℃
B. 15 ℃
C. 5 ℃
D. 10 ℃
【单选题】
25T型客车在A2级修程落成后,满负载运行1h试验,同一接线排各通电接头温度差不得高于___
A. 20 ℃
B. 15 ℃
C. 10 ℃
D. 22 ℃
【单选题】
25K型空调客车的空调控制柜(KLC40C-1T1)中6号线是___控制线
【判断题】
道德是人们用来评价别人和自己言行的标准和尺度
【判断题】
道德的完整含义,应该包含着二层意思:第一,道德是调整人们之间关系的行为规范;第二,道德是以善恶观念为标准的
【判断题】
道德属于上层建筑的范畴,是一种特殊的社会意识形态
【判断题】
道德作为上层建筑的一种特殊的社会意识形态不受经济基础决定,但要为经济基础服务
【判断题】
道德品质是道德意识和道德行为的辩证统一
【判断题】
“八荣八耻1. 道德是人们用来评价别人和自己言行的标准和尺度
【判断题】
社会主义荣辱观,是对我们党优秀革命道德传统和社会主义道德思想的继承发展
【判断题】
社会公道是全体公民在社会交往和公共生活中应该遵循的行为准则
【判断题】
职业道德并不是所有从业人员在职业活动中应该遵循的行为准则
【判断题】
所谓职业是指由于社会分工而形成的具有特定专业和专门职责,并以所得收入作为主要生活来源的工作
【判断题】
所谓职业道德,就是同人们的职业活动紧密联系的符合职业特点所要求的职业道德准则、道德情操与道德品质的总和
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【单选题】
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【单选题】
对单匝线圈来说,其产生的磁通与流过线圈电流的比值叫该线圈的___,也叫电感,用L表示。P11T54
【单选题】
电器的触头系统属于电器的___P15T82。
【单选题】
触头按工作性质分为静触头和___。P16T83
【单选题】
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C. 串励发电机
【单选题】
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【单选题】
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【单选题】
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电机本身是机械能和电能互相转换的设备___。P30T152
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