问题
选择题
The earthquake which happened in Japan _______ the 11th of March, 2011 was a big disaster.[ ]
A. at
B. on
C. in
D. to
答案
答案：B
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The earthquake which happened in Japan _______ the 11th of March, 2011 was a big disaster.[ ]
A. at
B. on
C. in
D. to
答案：B
，Aij表示行列式元素aij的代数余子式，则A13+4A33+A43等于：（）。