理想变压器原线圈接在如图所示的电压上，原副线圈匝数之比为10：1，串在原线圈上的
题型：多选题
问题：
| 理想变压器原线圈接在如图所示的电压上，原副线圈匝数之比为10：1，串在原线圈上的电流表的示数为1A，则以下叙述正确的是（ ） A．变压器输出功率为200W B．若n1=100匝，则输出端线圈的磁通量变化率的最大值为2 C．副线圈两端的电压表示数20 D．变压器的输入功率是由发电厂的输出功率决定的  |
Wb/s
V题型：多选题
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| Liu Sanzi is a young 1 from a village in Hunan Province. His parents want him to 2 out of school. It's very important for him to work 3 the farm. Because there are seven people in Liu's family and they are very poor. Many children 4 Liu Sanzi can't get an education because their families are poor. Now they can go to school 5 the help of Project Hope. In the last 15 years, this project 6 money and paid for the education for poor children 7 the countryside. Many people in China have 8 of Project Hope and have given money. But 40 9 children from poor families still need help. Because of Project Hope, thousands of child  ren have better lives. What can we do for Project Hope? 10 can we help? | ||||
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