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什么是高压开关设备?目前电网中哪些设备属于高压开关设备的范畴?

标准GB1094.3-2003对变压器的绝缘试验顺序进行规定,下列叙述中正确的是()

A. 短时感应耐压试验在外施耐压试验之前进行
B. 操作冲击试验在雷电冲击试验之前进行
C. 长时感应试验在短时感应试验之前进行

购房预定款性质的费用可以退还吗?

You are anchoring in 16 fathoms of water.On a small to medium size vessel,the().

Anchor may be dropped from the hawse pipe
B. Anchor should be lowered to within 2 fathoms of the bottom before being dropped
C. Scope should always be at least ten times the depth of the water
D. Scope should always be less than 5 times the depth of the water

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