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【单选题】
设A、B为n阶方阵，且AB=0(零矩阵)，则 ( )A.
A=0或B=0
B.
A+B=0
C.
D.
A
E.
+
F.
B
G.
=0
H.
A =0或 B =O
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举一反三
【简答题】垄断并不能消除竞争,反而使竞争变得更加复杂和剧烈。垄断下的竞争包括 A .垄断组织内部的竞争 B .垄断组织之间的竞争 C .垄断组织与非垄断组织之间的竞争 D .非垄断的中小企业之间的竞争
【简答题】我国著名幼儿教育家( )于( )年创办我国最早的幼儿教育实验中心——南京鼓楼幼稚园。
【单选题】The cause of the death of the goldfish was most probably ______.
A.
lack of care
B.
old age
C.
the small fish tank
D.
lack of water
【单选题】Guess the connections between goldfish and computers.
A.
Goldfish become more intelligent when they live near computers.
B.
People concentrate better when they have a pet goldfish next to their computer.
C.
Computers are making people's concentration similar to golfish.
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