问题
选择题
如图所示，理想变压器原线圈输入交流i=Imsinωt，副线圈按有一电流表和负载电阻R，电流表的示数为0.10A．在t= 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（ ）A．10：3 B．3：10 C．3：10 D．10  |
：3
答案
答案：D
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| 如图所示，理想变压器原线圈输入交流i=Imsinωt，副线圈按有一电流表和负载电阻R，电流表的示数为0.10A．在t=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（ ） A．10：3 B．3：10 C．3：10 D．10 |
答案：D
| 选出一个适当的词语替换句子中的划横线的部分。 |
| 1. He spent plenty of money on books. |
[ ] |
| A. many B. lots of C. a little D. a lot |
| 2. Don't worry. He'll come back in no time. |
[ ] |
| A. sometimes B. without time C. very soon D. from time to time |
| 3. The police searched for him for quite a long time but could not catch him. |
[ ] |
| A. looked for B. found C. noticed D. searched |
| 4. My mother enjoys music very much. |
[ ] |
| A. is like B. joins C. is good at D. loves |
| 5. On both sides of the road are green trees. |
[ ] |
| A. On all sides B. On neither side C. On either side D. On any side |