【判断题】
导致人体通过全身或发生二次事故而产生严重后果。 ()
A. 对
B. 错
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当梯子的高度大于 6m 时,要上、中、下三端绑扎。
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重复接地的接地电阻要求小于 4Ω。()
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临时接地线的连接要使用专用的线夹固定 ,其接地端通常采用绑扎连接 ,各连接点必须要牢固。
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装设剩余电流动作保护器虽然是一种很有效的触电防护措施 ,但不能作为单独的直接接触触电的防护手段。 ()
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运行中的电压互感器内部有放电声及其他噪声 ,线圈与外壳之间或引线与外壳之间有火花放电现象 ,应立即退出运行。 ()
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变压器并列运行 ,一般允许阻抗电压有± 10%的差值 ,若差值大 ,可能阻抗电压大的变压器承受负荷偏高 ,阻抗电压小的变压器承受负荷偏低 ,从而影响变压器的经济运行。 ()
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变压器一、二次侧绕组因匝数不同将导致一、二次侧绕组的电压高低不等 ,匝数多的一边电压低 ,匝数少的一边电压高 ,这就是变压器能够改变电压的道理。 ()
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所谓额定容量指 :在变压器铭牌所规定的额定状态下 ,变压器二次侧的输出能力 (kVA)。
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Refer to the exhibit. What is the effect of the given configuration?___
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【多选题】
Which two configurations can prevent VLAN hopping attack from attackers at VLAN 10?___
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【多选题】
What are two features of transparent firewall mode ___
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1.三相刀开关的图形符号与交流接触器的主触点符号是___。
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【单选题】
2.刀开关的文字符号是___。
A. QS
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【单选题】
3.行程开关的文字符号是___。
A. QS
B. SQ
C. SA
D. KM
【单选题】
4.交流接触器的文字符号是___。
A. QS
B. SQ
C. SA
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【单选题】
5.熔断器的作用是___。
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6.热继电器的作用是___。
A. 短路保护
B. 过载保护
C. 失压保护
D. 零压保护
【单选题】
7.交流接触器的作用是可以___接通和断开负载。
A. 频繁地
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【单选题】
8.三相异步电动机的启停控制线路由电源开关、熔断器、___、热继电器、按钮等组成。
A. 时间继电器
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D. 漏电保护器
【单选题】
9.三相异步电动机的启停控制线路中需要有___、过载保护和失压保护功能。
A. 短路保护
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