问题
多选题
| 如图所示，通电矩形导线框abcd与无限长通电直导线MN在同一平面内，电流方向如图所示，ab边与MN平行．关于MN的磁场对线框的作用；下列叙述中正确的是（ ） A．线框有两条边所受的安培力方向相同 B．线框有两条边所受的安培力大小相同 C．线框所受的安培力的合力向左 D．cd所受安培力对ab边的力矩不为零  |
答案
BC
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| 如图所示，通电矩形导线框abcd与无限长通电直导线MN在同一平面内，电流方向如图所示，ab边与MN平行．关于MN的磁场对线框的作用；下列叙述中正确的是（ ） A．线框有两条边所受的安培力方向相同 B．线框有两条边所受的安培力大小相同 C．线框所受的安培力的合力向左 D．cd所受安培力对ab边的力矩不为零 |
BC
完形填空 (10分) Zhou Yang was born on June 9th, 1991. 1 she was four years old, she got a serious illness. Luckily, she got 2 soon, so her parents decided to make her play sports. They thought that playing sports could keep her 3 good health. When she was eight years old, her father 4 her a pair of skates. She started to skate that year. She practiced skating 5 more than eight hours a day. One of 6 teammates said, “Zhou Yang always practices skating hardest.” In the same year, Zhou Yang 7 part in her school’s running competition. One teacher found that she had a great potential（潜力） for 8 . In 2010, she 9 a gold medal in the Olympic Winter Games. Chinese people are 10 proud of her.
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