设A是一个n阶方阵,已知|A|=2,则|-2A |=()。
A. -2n+1
B. (-1)n2n+1
C. (-2)n+1
D. -22
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A.officialsB.civiliansC.citizensD.generals
A. officials
B. civilians
C. citizens
D. generals
A.timeB.eraC.aspectD.period
A. time
B. era
C. aspect
D. period
A.explodedB.opened upC.dug outD.explored
A. exploded
B. opened up
C. dug out
D. explored
A.calledB.knownC.by nameD.named
A. called
B. known
C. by name
D. named