如图15-4-8所示的是磁感应强度B、正电荷速度v和磁场对电荷的作用力F

如图15-4-8所示的是磁感应强度B、正电荷速度v和磁场对电荷的作用力F三者方向的相互关系图（其中B垂直于F与v决定的平面，B、F、v两两垂直）.其中正确的是（　　）

图15-4-8

答案

相关题目

22．阅读下面一段文字，从剧作本身的角度分条概括《平凡的

22．阅读下面一段文字，从剧作本身的角度分条概括《平凡的世界》受到好评的原因，每条不超过8字。（4分）相比以“狗血”话题为宣传噱头、并以收

为了测定光在透明的有机玻璃中的传播速度，实验室中可提

为了测定光在透明的有机玻璃中的传播速度，实验室中可提供的器材有：短形有机玻璃条(长约40cm)、秒表、平行光光源、刻度尺、三角板、木板、白纸

阅读下面的诗歌，完成后面的题目。灞上秋居马戴灞原风

阅读下面的诗歌，完成后面的题目。灞上秋居马戴灞原风雨定，晚见雁行频。落叶他乡树，寒灯独夜人。空园白露滴，孤壁野僧邻。寄卧郊扉①久

Not only a popular singer was Yao Beina, but also she was an energetic

Not only a popular singer was Yao Beina, but also she was an energetic and warm-hearted angel. She had her corneas (眼角膜) donated to two men who needed them, which helped them see the wo

Would you please my baby brother while I'm cooking?A．take out ofB．t

Would you please my baby brother while I'm cooking?A．take out ofB．take care ofC．take part inD．take away from

汉朝时期，中国同西方的陆上贸易通道称为“丝绸之路”，

汉朝时期，中国同西方的陆上贸易通道称为“丝绸之路”，其路线是（） A. 长安——河西走廊——今新疆——西亚——欧洲 B

—It seems that Spain will win the match. —________. Germany also has strong

—It seems that Spain will win the match. —________. Germany also has strong players. A．That's a pity B．It's very kind of you C．I think so D．

When I became an amputee at age 29, I was forced to rethink the idea of physica

When I became an amputee at age 29, I was forced to rethink the idea of physical perfection. My life became different, as I changed from an acceptably attractive woman to an object of pity and __50_

如图15-4-8所示的是磁感应强度B、正电荷速度v和磁场对电荷的作用力F

答案

相关题目

最新题目