问题
选择题
| 如图所示，穿过线框abcd的磁场垂直纸面向外，且均匀增强，平行板电容器C两极板之间有一个质量为m、带电量为q的带电微粒处于静止状态，现用绝缘柄把电容器两极板的距离稍微拉大一点，则下列说法正确的是（ ） A．带电微粒向下加速运动 B．带电微粒向上加速运动 C．带电微粒仍然处于静止状态 D．条件不足，无法判断  |
答案
答案：C
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| 如图所示，穿过线框abcd的磁场垂直纸面向外，且均匀增强，平行板电容器C两极板之间有一个质量为m、带电量为q的带电微粒处于静止状态，现用绝缘柄把电容器两极板的距离稍微拉大一点，则下列说法正确的是（ ） A．带电微粒向下加速运动 B．带电微粒向上加速运动 C．带电微粒仍然处于静止状态 D．条件不足，无法判断 |
答案：C
Now more and more people get to know the importance of doing sports. It can bring fun us and it can also make us . what should we do? First, we should choose (选择) our favorite ones from kinds of sports. The sports must be right for us. Second, we must warm up (热身) before . Third, a beginner, you had better have an exercise plan. For example, are you going to exercise each time? How many a week? If you’re a of sports, it’s important to know this. Last but not least, you had better not exercise if you feel , or it will be very dangerous.
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