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
- 若<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_5e87b1af-bca5-443b-a243-291827849f02.png" />,则<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_ad6fa5ac-dbcf-4b8b-8daa-181c5a784826.png" />的初值<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_db6a652c-73b6-49f0-aa72-b78bfc327b03.png" />为? 0|不存在|1<br >|-1
- 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}
- 对于不同柔度的塑性材料压杆,其最大临界应力将不超过材料的( )。 A: 比例极限<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_46e217f6-4801-4de3-838b-1ef9d8683f04.png"> B: 弹性极限<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2999d238-6413-4354-8c17-705d258519c4.png"> C: 强度极限<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_da3bc35f-38ae-4b4d-a9bf-4355200cad9b.png"> D: 屈服极限<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_1e12ef4a-90e8-4102-b0e8-e409f85e7a72.png">
内容
- 0
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}
- 1
设A,B为任意两个n阶方阵,则下列一定成立的是 ( ) 未知类型:{'options': ['[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_33399133-78a2-46d1-b0e6-585d3e1a61fa.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_d308b840-8167-4c60-98c2-50ad54a58d80.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_0836c6f0-9141-4013-8ffa-bd3be454df0a.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_46c561a2-1836-4982-9c80-e1bbc2dc9af1.png"]'], 'type': 102}
- 2
<img src="http://edu-image.nosdn.127.net/7C967829F4C605BD5700F98BFAF57A1B.jpg?imageView&thumbnail=890x0&quality=100" />? 错误|错误|错误|<img src="http://edu-image.nosdn.127.net/FB19BA6F6B1487CE68F33429508760F3.jpg?imageView&thumbnail=890x0&quality=100" />
- 3
设三阶方阵A的秩是2,则与A等价的矩阵为( ) 未知类型:{'options': ['[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2a68ab7b-9b7e-4607-abde-e255189c845c.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_208fb5a8-85c0-4a53-8cf2-673752bf5034.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_08c0964d-f78b-44eb-ac06-5c18ec1142e0.png"]', '[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_3d5b7bfd-bef2-4920-8749-90e0f59a4770.png"]'], 'type': 102}
- 4
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}