问题
多选题
| 如图为理想变压器原线圈所接交流电压的波形．原、副线圈匝数比n1：n2=10：1，串联在原线圈电路中电流表的示数为1A，下列说法正确的是（ ） A．变压器输出端所接电压表的示数为20 B．变压器的输出功率为200W C．变压器输出端的交流电的频率为50Hz D．穿过变压器铁芯的磁通量变化率的最大值为20  |
V
/n2Wb/s
答案
BCD
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| 如图为理想变压器原线圈所接交流电压的波形．原、副线圈匝数比n1：n2=10：1，串联在原线圈电路中电流表的示数为1A，下列说法正确的是（ ） A．变压器输出端所接电压表的示数为20 B．变压器的输出功率为200W C．变压器输出端的交流电的频率为50Hz D．穿过变压器铁芯的磁通量变化率的最大值为20 |
BCD
| 完形填空。 | |||
| My parents divorced(离婚)when I was 8 years old: Their 1 was a mistake(错误)of World War Ⅱ. And about 50 years ago, I was the only child I knew who didn’t have a father at home on Father’s Day. Divorce was very 2 back then. So when my friends were in town 3 for presents for their fathers, I decided since my mother was both Mother and Father, 4 . else was like her, who better deserved (值得)a present on Father’s Day than her? I bought her a little set of tools(工具), just a few things, hammer, pliers and screwdriver and a box to put all these things in. I got some 35 from my grandfather and named it Mother’s Tool Box. She was 6 , more at the thought of being cared for on Father’s Day than of the present.She always said she 7 her Father’s Day memories better than the Mother’s Day Ones. It made her feel 8 and she was. I have noticed(注意到)in the past few years, greeting cards are even made for“Mother on Father’s Day”. 9 , my mother has got cards on Father’s Day.By the way,she 10 just how to use those tools over the years. | |||
| ( )1. A. decision ( )2. A. unfriendly ( )3. A. choosing ( )4. A. somebody ( )5. A. ideas ( )6. A. surprised ( )7. A. remembered ( )8. A. special ( )9. A. From then on ( )10. A. wondered | B. agreement B. uncommon B. buying B. nothing B. themes B. excited B. got B. important B. After that B. thought | C. marriage C. uncomfortable C. shopping C. anyone C. service C. crazy C. liked C. helpful C. Since then C. decided | D. experience D. unlucky D. planning D. no one D. support D. grateful D. missed D. welcome D. Even then D. knew |