问题
选择题
| The apples on this tree are bigger than _______on that one. |
A. ones B. those C. them D. apples |
答案
答案：B
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| The apples on this tree are bigger than _______on that one. |
A. ones B. those C. them D. apples |
答案：B
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