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一台三相电力变压器，二次侧带对称负载运行时的端电压恰好等于变压器二次侧的空载电压，则该负载一定是( )。 (A)纯电阻负载 (B)电感性负载 (C)电容性负载 (D)无法判断
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A.
about
B.
in
C.
with
D.
of
【简答题】Early in the third century, China's Han Dynasty fell apart. From the dust stood three kingdoms: Wei, Shu and Wu. They fought against each other in order to unite all of China. Centuries later, their s...
【简答题】Joseph Goldberger was a doctor for the Unite States Public Health Service. In 1912, he began to study a disease that was killing thousands of people in the South. The disease was pellagra(烟酸缺乏病). Doct...
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Peace.
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A.
理想信念昭示奋斗目标
B.
理想信念提供前进动力
C.
理想信念提高精神境界
D.
理想信念克服前进困难
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