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【判断题】
四类最重要的原生矿物分别为氧化物类、硫化物类、磷酸盐类、硅酸盐类。A.
正确
B.
错误
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举一反三
【单选题】“信息是一种可创造价值的知识，它的价值不但可以替代资本、劳动力、物资，而且比它们更重要”表明了理护理信息的( )
A.
可识别性
B.
不可储存性
C.
可传递性
D.
可替代性
【单选题】Seldom____________ video games ever since they entered college.08湖北
A.
did have play
B.
they played
C.
have they played
D.
they have played
【简答题】Seldom ____(they play)video s ever since they entered college.
【单选题】Seldom____________ video games ever since they entered college.
A.
they have played
B.
they played
C.
have they played
D.
they have played
【单选题】Seldom______video games ever since they entered college.
A.
they have played
B.
they played
C.
have they played
D.
did they play
【简答题】设列矩阵α=(a，0，…，0，a)T，a<0；E为n阶单位矩阵，矩阵A=E-ααT，B=E+(1/a)ααT，其中A的逆矩阵为B，则a=________．
【简答题】设n维向量α=(a，0，…，0，a) T ，a＜0;E为n阶单位矩阵，矩阵A=E-αα T ， ，其中A的逆矩阵为B，则a=?
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