【判断题】
粉尘的比电阻值与电除尘的性能关系极大，关系到电除尘器的除尘效率和设备运行的稳定性
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【判断题】
粉尘比电阻小，说明粉尘的导电性能好，因此电除尘器适合比电阻小的粉尘
【判断题】
当高压硅整流变压器至二次电表的连接导线接地时，二次电流为零
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灰斗内的积灰过多会导致短路，使电场停运，所以要及时清灰，灰斗内存灰越少越好
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切换电场中发现一、二次电压表、电流表指示不正常时，应立即停止硅整流变压器的运行
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在锅炉点火前电除尘一般要进行空载伏安特性试验，以检验电场内部情况及高压供电装置的性能
【判断题】
低比电阻粉尘容易因静电感应获得正电荷，使沉积在极板上的粉尘重新排斥回电场空间，而使除尘效率降低
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电场异极间距局部间隙变小是造成低电压下发生严重闪络、跳闸事故的原因之一
【判断题】
电除尘器停运后，开启人孔门时应放电一次
【判断题】
加热支持绝缘子周围温度的电加热器可实现恒温控制
【判断题】
向电除尘器供电的低压380V母线通常采用单母线接线或单母线分段接线
【判断题】
电力系统的负荷可分为有功负荷和无功负荷两种
【判断题】
闸刀开关是最简单的低压电气开关，只能手动操作
【判断题】
实际工况下，在电除尘器中的气流状态多为紊流
【判断题】
采用200℃以上的高温电除尘器可以降低粉尘比电阻
【判断题】
在电除尘器的高压输入端有阻尼电阻，用以消除高频冲击振荡
【判断题】
电除尘器的每次闪络，都将造成局部粉尘透过率减小
【判断题】
实验室测定的粉尘比电阻一般比现场测定值小
【判断题】
电除尘器的出口，应有密封装置，以防止漏风
【判断题】
电除尘器的除尘效率越高，选取的驱进速度值越大
【判断题】
离心泵的汽蚀余量的大小取决于吸入系统装置，与泵本身的设计和制造无关
【判断题】
正常运行中，若发现电动机冒烟，应申请停机
【判断题】
除灰设备只清除从除灰器出来的细灰，并将其送往灰场
【判断题】
气力除灰系统中所用的压缩空气必须干燥处理
【判断题】
除尘器处理的烟气温度不同，烟气量要发生变化，粉尘比电阻也要发生变化
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异极距每增加10mm，二次击穿电压至少应递增2.5KV
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安全色规定为红、蓝、黄、绿四种颜色，其中黄色是禁止和必须遵守的规定
【判断题】
正常运行时，高压硅整流变压器外壳需可靠接地
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( ) 26. Where does the writer of "The little Prince" come from?
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( ) 27. What does the prince do after the fox tells him a secret?
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B．He meets many more strange adults on other planets．
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D．He discovers interesting things such as a snake, other roses and a fox
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( ) 28. What does "The little Prince" mainly talk about? It' s about _________．
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( ) 29. What is the writer's main purpose（目的）in writing this passage？
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( ) 30. Why did the father not ask his son not to do this and do that？
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( ) 31. What would someone learn from this passage？
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( ) 32. What may be the proper Chinese for the underlined part in the passage？
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( ) 33. Why did Natalie Smith pay for the six cars behind her?
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( ) 34. Judy Foreman copied down the phrase because she ___ .
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( ) 35. Who came up with the phrase according to the passage?
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( ) 36. What can we infer from the last paragraph?
A. People should practice random kindness to those in need.
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D. People who receive kindness are likely to pay it back to the giver.
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( ) 37.The greatest river for navigation is ___________.
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( ) 38. From a dam, people can use the water for ___________.
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( ) 39. The water in the river is polluted because of _____________.
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( ) 40. The best title of the passage is ___________.
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