手动准同步并车过程中,如果整步表指针指在下面的中点不动,这说明()。
A. 待并机与电网频率相等,相位差180°
B. 待并机与电网频率相等,相位差为0°
C. 待并机频率低于电网频率
D. 待并机频率高于电网频率
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翻译:《易》有四象,所以示也;系辞焉,所以告也;定之以吉凶所以断也。
切换27.5千伏电压互感器转换小开关时,时间为什么不能过长?应控制在几秒?
Besides saving distance along the track line,another advantage of the Scharnow Turn over the Williamson Turn in a man overboard situation because().
A. it is faster
B. it can be used in both the immediate action and the delayed action situations
C. in fog,if the turn is started as soon as the man goes over,the vessel will be at the point where he went over when the turn is completed
D. it returns the vessel to the original track line on a reciprocal course
你组织本单位一些退休老同志乘火车旅游,不巧遇上暴雨,导致前方铁轨塌陷,火车无法继续行驶,要修复至少需要一天时间,而此时有部分老同志由于连降暴雨而身体不适,这时你怎么办?