钾的光电效应红限波长是550nm，求钾的电子逸出功
未知类型：{'options': ['[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_4b0c6df6-936e-48d6-a6f7-4af90f48b3eb.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6abcc1e9-f459-4f9d-8cfa-a3d67a1aeb1f.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_5536ce6e-6fcc-40c8-97b0-8fdbbc084c82.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2e4b3c88-95cf-499d-8b31-ef18d5ecaab4.png"]'], 'type': 102}
未知类型：{'options': ['[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_4b0c6df6-936e-48d6-a6f7-4af90f48b3eb.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6abcc1e9-f459-4f9d-8cfa-a3d67a1aeb1f.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_5536ce6e-6fcc-40c8-97b0-8fdbbc084c82.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2e4b3c88-95cf-499d-8b31-ef18d5ecaab4.png"]'], 'type': 102}
举一反三
- 设[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_067016aa-77f2-4aff-bd36-e3fa5f1bd893.png"],[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_358ab06c-7f19-4ae6-ba82-424c72bd4d18.png"],则[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2b561af0-b65d-4e5e-936b-72b15b4f0f56.png"][img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_92284d1b-6fe3-4dc1-a732-618796cd01a4.png"] A: 6 B: 10 C: 8 D: 4
- 下列矩阵，哪一个是正交矩阵（ ） 未知类型：{'options': ['[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_e3bcbe32-bf4f-4dd7-87eb-435166d4a694.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2dd5a805-5f17-4578-950f-b0e99cb4ace5.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_fb404ce8-29fb-4a21-9f66-2e1cc1e8e6b2.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6238ef9e-3ec5-4c01-8429-4fbbb82bc5ff.png"]'], 'type': 102}
- 以下对相关系数与回归系数的描述正确的是 未知类型：{'options': ['[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_a239429a-7fee-4b87-8988-34ecbff62f78.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_8e840276-5eb5-496e-99e5-dbf0fc08a23b.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_44c8e13f-08e0-425a-b275-0409b8954e16.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_b013f5a5-447f-46ad-89ec-f4a2c5927468.png"]'], 'type': 102}
- A是n阶实方阵，则A是正交矩阵的充要条件时（ ） 未知类型：{'options': ['[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_160765c0-82ae-41e7-92cc-7f9f38df73cf.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_f91bd7e2-e47b-421c-a1f4-c37277340526.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_0156ee63-63f2-4377-90e7-ee87b08fc01b.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_bb7bc755-5c94-491e-9545-af103b5d2bf3.png"]'], 'type': 102}
- [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}