问题
选择题
Unwilling to give up slavery, the South _____ from th
e Union and set up a state of their own, resulting in
the American Civil War. [ ]
A. broke away
B. ran away
C. escaped away
D. cut away
答案
答案：A
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时（T为交流的周期），原线圈中的电流瞬时值为0.03A．变压器的原、副线圈的匝数比为（ ）
：3