倒闸操作主要是指拉开或合上断路器或隔离开关,拉开或合上直流操作回路,拆除和装设临时接地线及检查设备绝缘等。
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国家规定的安全色有四种,红色表示()、蓝色表示()、黄色表示警告、注意、绿色表示指示、安全状态、通行。
A towboat has the same draft as the barges it is pushing ahead. If the distance from the stern of the towboat to the head of the tow is 260m,where is the approximate location of the pivot point of the unit?()
At the head of the tow
B. 75m from the head of the tow
C. 120m from the head of the tow
D. 180m from the head of the tow