问题
选择题
There is _____ report in today's newspaper. It's about the International Film Festival, Shanghai.[ ]
A. a
B. an
C. the
D. /
答案
答案：A
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There is _____ report in today's newspaper. It's about the International Film Festival, Shanghai.[ ]
A. a
B. an
C. the
D. /
答案：A
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