假设有列表x=[100,'100',[100],"100"],则x[2]表示的元素是()。
A: 100
B: ‘100'
C: [100]
D: "100"
A: 100
B: ‘100'
C: [100]
D: "100"
举一反三
- 补偿导线的环境温度应控制在（ ）℃之间。[1分] A: 0～100 B: 20～100 C: 30～100 D: -10～100
- 逻辑符号如图所示，表示“或”门的是（ ）。 未知类型：{'options': ['[img src="http://edu-image.nosdn.127.net/D65F2AE7EE4555576A6E4DAD96BD0E48.png?imageView&thumbnail=890x0&quality=100"]', '[img src="http://edu-image.nosdn.127.net/8A0CEC8CE2A12DA585F014307DA8D354.png?imageView&thumbnail=890x0&quality=100"]', '[img src="http://edu-image.nosdn.127.net/F64BEE050C34BBEF29945766BBEEC850.png?imageView&thumbnail=890x0&quality=100"]', '[img src="http://edu-image.nosdn.127.net/EA0A3AD03C781D6E9FB17D60F8A76F52.png?imageView&thumbnail=890x0&quality=100"]'], 'type': 102}
- 如果df1=pd.DataFrame([[1,2,3],[NaN,NaN,2],[NaN,NaN,NaN],[8,8,NaN]])，则 df1.fillna(100)=
- [img src="http://edu-image.nosdn.127.net/61AE584E303C1B2E4BAC078E8F1001DF.bmp?imageView&type=jpeg&thumbnail=890x0&quality=100"] 未知类型：{'options': ['[img src="http://edu-image.nosdn.127.net/130A64ABA6A61E687A5F469C34143002.bmp?imageView&type=jpeg&thumbnail=890x0&quality=100"]', '[img src="http://edu-image.nosdn.127.net/20F7AE0D2D61D3B7C77AC42946420A5E.bmp?imageView&type=jpeg&thumbnail=890x0&quality=100"]', '', '[img src="http://edu-image.nosdn.127.net/EA9E8710C7E7C6FB3911A4B2C566E8FF.bmp?imageView&type=jpeg&thumbnail=890x0&quality=100"]'], 'type': 102}
- 接上题，逻辑电路图为（） 未知类型：{'options': ['[img src="http://edu-image.nosdn.127.net/91AA08EAEEF0CF9B930B1286E136B85A.png?imageView&thumbnail=890x0&quality=100"]', '[img src="http://edu-image.nosdn.127.net/DA6374A086B131D13FA4CDF17BD6C1B3.png?imageView&thumbnail=890x0&quality=100"]', '[img src="http://edu-image.nosdn.127.net/0BB0C036A22E7DD70493E44A3F53ECB6.png?imageView&thumbnail=890x0&quality=100"]', '[img src="http://edu-image.nosdn.127.net/3C239DB911650EF5FE9C2257BB5E9FC9.png?imageView&thumbnail=890x0&quality=100"]'], 'type': 102}