设为矩阵,若为齐次线性方程组的基础解系,则 ( )
A.
B.
C.
D.
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If blood stagnation affects the heart, what kind of symptoms usually may be found? ( )
A. Mental disturbances such as delirious raving
B. Chest pain
C. Suffocation
D. Insomnia
A.
B.
C.
D.
A. Mental disturbances such as delirious raving
B. Chest pain
C. Suffocation
D. Insomnia