中国大学MOOC: http://edu-image.nosdn.127.net/F1CE58D7D0E614C38CE08FBF5E81B0A9.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100如图电路使用138和缓冲器实现了8选1的（ ）
举一反三
- [img src="http://edu-image.nosdn.127.net/08446072FAF419F6F5FB52568347381A.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100"][img src="http://edu-image.nosdn.127.net/950BA54637600A69A19C15A66AC36500.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100"] A: -4 B: +2 C: -1 D: -2
- [img src="http://edu-image.nosdn.127.net/E9ECD91FC8FB3437CBAE9E731E05C1F9.bmp?imageView&type=jpeg&thumbnail=890x0&quality=100"] 未知类型：{'options': ['[img src="http://edu-image.nosdn.127.net/844D4F13280FCB22936CC001C2655964.bmp?imageView&type=jpeg&thumbnail=890x0&quality=100"]', '0', '1', '[img src="http://edu-image.nosdn.127.net/39355C3F2BE9AE15346505596CAABAF4.bmp?imageView&type=jpeg&thumbnail=890x0&quality=100"]'], 'type': 102}
- 中国大学MOOC: 下图所示电路中，A点电位为（ ）。 http://edu-image.nosdn.127.net/260604D9AAD1E3B3E841F5B2790A5A0A.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100
- 中国大学MOOC: 电路如图，电流I为（ ）A。http://nos.netease.com/edu-image/4B9C39BFCC9815A42BE4733717880C94.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100
- [img src="http://edu-image.nosdn.127.net/C8EC0B0C890042F81AB9CF0941243122.bmp?imageView&type=jpeg&thumbnail=890x0&quality=100"] 未知类型：{'options': ['2', '0', '1', '[img src="http://edu-image.nosdn.127.net/EAB437E744FF87F763873F106CCCE3E9.bmp?imageView&type=jpeg&thumbnail=890x0&quality=100"]'], 'type': 102}