问题
选择题
| Tom is ______ that he can't go to school. |
A. so a young boy B. a so young boy C. a such young boy D. such a young boy |
答案
答案：D
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| Tom is ______ that he can't go to school. |
A. so a young boy B. a so young boy C. a such young boy D. such a young boy |
答案：D
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