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
搜题请搜索小程序“爱下问搜题”
| 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 |
BCD
| 阅读理解。 |
 |
| 1. How much is it if I want to buy a large spicy chicken pizza? |
[ ] |
| A. $15 B. $19 C. $22 D. $ 23 |
| 2. Bobby wants the digital watch. What must he buy in order to get it? |
[ ] |
| A. Half a dozen chicken wings. B. Buy something over forty dollars. C. Order something over eighty dollars. D. Five pizzas or more. |
| 3. The service hour on Saturday is _______ hours longer than on Fridays. |
[ ] |
| A. 7 B. 6 C. 8 D. 5 |
| 4. Chris ordered ten large California pizzas for his team of workers. How much did he pay for his order? |
[ ] |
| A. $ 176 B. $220 C. $230 D. $224 |