如图所示,某理想变压器的原、副线圈的匝数均可调节。原线圈两端电压为一最大值不变的正弦式交变电流,在其他条件不变的情况下,为使变压器输入功率增大,可使

A、原线圈匝数n1
B、副线圈匝数n2
C、负载电阻R的阻值增大
D、负载电阻R的阻值减小
BD
如图所示,某理想变压器的原、副线圈的匝数均可调节。原线圈两端电压为一最大值不变的正弦式交变电流,在其他条件不变的情况下,为使变压器输入功率增大,可使
A、原线圈匝数n1
B、副线圈匝数n2
C、负载电阻R的阻值增大
D、负载电阻R的阻值减小
BD
完形填空。 | ||||
1 , I'm Meg. I'm twelve years 2 . I have a brother 3 a sister. My brother is nine and my sister is 4 four. I like hamburgers and salad. My brother likes 5 and my sister likes ice cream. We 6 a small sports collection. We all like tennis. Today is my 7 birthday. It's January 21st. There's a big cake 8 the table. How 9 is it? Do you know? It's seven 10 . Come to my mother's birthday party and have some cake. | ||||
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