问题
选择题
如图1所示，一理想变压器原、副线圈匝数之比为5：1，交流电源的电压
（V），电阻
Ω，电压表、电流表均为理电表。则下列说法正确的是 （ ）
A．交流电的频率为100Hz
B．电阻R上的功率为1100W
C．电压表V的示数为
D．电流表A1的示数为
答案
答案：D
搜题请搜索小程序“爱下问搜题”
如图1所示，一理想变压器原、副线圈匝数之比为5：1，交流电源的电压（V），电阻Ω，电压表、电流表均为理电表。则下列说法正确的是 （ ）
A．交流电的频率为100Hz
B．电阻R上的功率为1100W
C．电压表V的示数为
D．电流表A1的示数为
答案：D
| 完形填空 | ||||
| I sent copies of the draft of my last book to both my sisters. Naomi, the oldest, read it and sent me detailed (详细的) and helpful __1__. Mimi kept it a while, and then told me that she had begun reading it but hadn't gotten very __2__. She realized that she'd rather give me a necklace of glass beads (珠子) that she made. I couldn't have been more __3__. The necklace is beautiful, and wearing it __4__ me of Mimi's loving __5__, as well as her __6__, so different from mine. I have another reminder of Mimi's support: an e-mail message that I have __7__ over my writing desk. It __8__: "Stop reading this, and go back to writing your book. Love, Mimi." This __9__ makes me smile- and get back to work- whenever I glance at it. Naomi is always __10__ me, too, in her different way. __11__ each of my books __12__, I appeared on television, and my parents would be sure to __13__. I always knew that when I arrived home, the light on my answering machine __14__ be blinking, (闪烁) and when I __15__ "play" I'd heard my mother's voice saying __16__ like: "I loved watching you, you were wonderful, I'm proud of you!" My mother died while I was writing my previous book. The first time I arrived home after a television __17__, I was afraid of walking past the dark, __18__ answering machine. But the __19__ light was __20__. I pushed "play"- and heard Naomi's voice: "I loved watching you, you were great, I'm so proud of you." | ||||
|