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【单选题】
设A为n阶对称矩阵，B为n阶反对称矩阵，则下列矩阵中为反对称矩阵的是______。A.
AB-BA
B.
BA+AB
C.
(AB) 2
D.
BAB
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反馈参考答案：
举一反三
【单选题】What does the man say about the mechanic?
A.
The mechanic is his neighbor.
B.
The mechanic is reliable.
C.
This is the first time the mechanic has done work for him.
D.
The mechanic often overcharges strangers.
【简答题】结缔组织(connective tisstue)
【单选题】Which one belongs to the narrow sense of connective tissue ?( )
A.
connective tissue proper
B.
blood
C.
lymph
D.
bone
E.
cartilage
【单选题】mechanic
A.
n.直觉,直觉的知识
B.
n.友谊,团体,会员资格,奖学金
C.
n.技工,机修工;adj.手工的,（使用)机械的
D.
n.多样,种类,多样化;n.杂耍
【简答题】Photo Mechanic
【简答题】mechanic
【单选题】Which of the following can be classified as "connective tissue proper"?
A.
Adipose tissue
B.
Dense irregular connective tissue
C.
Bone
D.
Blood
E.
Cartilage
【单选题】Mechanic A can change a tire in 1 hour and change a sparkplug in 2 hours. Mechanic B can change a tire in 0.5 hours and change a sparkplug in 0.25 hours. Who has the comparative advantage in changing ...
A.
Need more information
B.
Both mechanics
C.
Mechanic B
D.
Mechanic A
【简答题】A.Cleaner. B.Mechanic. C.Porter. D.Salesman.
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