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
短文填空，从下面方框中选出10个单词，用它们的适当形式填入短文空格内，使短文意思正确、通顺(每词限用一次)。请将答案依次填入下边表格内。（每小题1分，共10分）
Zhao Xing, with only a map, a travel bag and 30 yuan, left the Chinese mainland for the 1 time to Taiwan. At the airport, she 2 by a man who even told her his phone number. A bus driver was kind enough 3 her up when she fell 4 on the ride. In Taiwan, Zhao told the man who 5 her a ride that she was from Beijing. The man asked if there was 6 else he could do to help make her journey 7 . “After 8 back and thinking over everything I’ve experienced, I realized that the people impressed me the most, not the beautiful scenes or tasty food,” Zhao wrote in her online diary. From Beijing to Taiwan, so close, so far away. Zhao’s wish is to encourage 9 to realize their own dreams of making the world a 10 , more friendly place for all. |