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【单选题】
地球中心的压力为 Pa
A.
10 11
B.
10 8
C.
10 14
D.
10 16
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【单选题】已知 A 是矩阵,求 A 的对角矩阵函数是 _______ , 求 A 的下三角矩阵函数是 ______ 。
A.
第一空: eye 第二空: tril
B.
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