问题
不定项选择
如图所示，一闭合直角三角形金属线框abc以速度v匀速穿过边界为矩形的匀强磁场区域。从bc边进入磁场区开始计时，到a点离开磁场区的过程中，线框内感应电流的变化情况是（以逆时针方向为电流的正方向）
A．
B．
C．
D．
答案
答案：D
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如图所示，一闭合直角三角形金属线框abc以速度v匀速穿过边界为矩形的匀强磁场区域。从bc边进入磁场区开始计时，到a点离开磁场区的过程中，线框内感应电流的变化情况是（以逆时针方向为电流的正方向）
A．
B．
C．
D．
答案：D
| 根据对话情景和内容,从对话后所给的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。(说明:E涂AB；F涂AC；G涂AD) | |
| A. You are lucky to be in such a big city where everything is wonderful. B: I don't think so. 1 A: Why? City life seems to be very interesting and comfortable. B: 2 You see citizens are obliged to accept an unnatural way of life. They can hardly enjoy sunshine because of tall buildings around their houses. A: That's terrible. 3 B: Yes, perhaps. But the cost of living is much higher. 4 A: I didn't think of that. Now I'd rather live in my village all my life. Would you like to go to the country for a change? B: Great! 5 | |
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