更多"The system will include various （） "的相关试题:
[单项选择]The refrigeration system low pressure cutout switch is actuated by （）.
A. an electric system manager
B. a sensing bulb at the tail coil of the evaporator
C. pressure changes in the suction line
D. failure of the king solenoid valve
[单项选择]The purpose of the refrigeration system low pressure cutout switch is to （）
A. protect the compressor from liquid flood back
B. protect the compressor from low discharge pressure
C. start and stop the compressor upon system demand
D. start the compressor after a drop in the evaporator pressure
[单项选择]In an operating refrigeration system low on refrigerant, a liquid line sight glass will（）
A. be clear
B. be blue
C. be light green
D. show bubbles
[单项选择]The oil discharge monitoring system in the oil tanker vessels is used for detecting the amount of oil discharged overboard to ensure that it does not exceed（）
A. 15 liters nautical mile
B. 30 liters nautical mile
C. 60 liters nautical mile
D. 100 liters nautical mile
[单项选择]In an air conditioning system, low head pressure associated with a reciprocating compressor can be the result of （）
A. broken valve springs
B. tight drive belts
C. high line voltage
D. air in the system
[单项选择]In an alternating current electrical system, a low system power factor is a direct sign of （）
A. wasted energy
B. efficient operation
C. a short in the exciter field windings
D. an excessive number of minor system grounds
[单项选择]The low pressure side of a refrigeration system is considered to exist from the （）.
A. expansion valve to the compressor
B. receiver to the expansion coil
C. expansion valve to the evaporator
D. condenser to the expansion valve
[单项选择]Compared to a low pressure system，generally the air in a high is（）.
A. warmer，less dense，and less stable
B. cool，more dense，and drier
C. muggy and cloudy
D. extremely moist with high relative humidity
[单项选择]The passing of a low pressure system can be determined by periodically checking the（）.
A. Thermometer
B. Hygrometer
C. Barometer
D. Anemometer
[单项选择]公式Qc=P（tanφ1-tanφ2）中P是指（）。
A. 最大有功功率
B. 最小有功功率
C. 平均有功功率
D. 瞬时有功功率
[判断题]使用QS1型交流电桥测量tanØ时，温度对tanØ测量结果影响很大。尤其当试验温度小于0℃或天气潮湿（相对湿度大于85%）条件下测得的tanØ值，不能反映设备的实际绝缘状况。
[多项选择]使用QS1型交流电桥测量tanØ时，造成-tanØ值出现的原因有（）
A. 温度影响
B. 强电场干扰
C. 测量中接线错误
D. 测量有抽取电压装置的电容式套管时，套管表面脏污
[判断题]使用QS1型交流电桥测量tanØ时，应尽量选择与历次试验相近温度条件下进行绝缘tanØ试验。
[判断题]使用QS1型交流电桥测量tanØ时，设备温度不同，所测得的tanØ值不同。但可以用一个典型的温度换算系数进行tanØ的温度换算。
[判断题]使用QS1型交流电桥测量tanØ时，温度对tanØ测量结果影响很大。绝大多数情况下，对同一被试设备，其tanØ随温度的升高而减少。
[单项选择]水泥细度筛析法是用边长为80tan和45tan的方孔筛对水泥进行筛析试验，用（）来表示水泥的细度。
A. 筛余质量
B. 筛余百分率
C. 筛余千分率
D. 筛余体积率
[简答题]JSP中动态INCLUDE与静态INCLUDE的区别是什么？
[简答题]离线LOW-E与在线LOW-E的优缺点？
