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【单选题】
配送按配送的时间及数量分类，可分为定时配送、定量配送、定时定量配送、定时定路线配送以及（）A.
企业内部配送
B.
企业间配送
C.
定时定量定点配送
D.
共同配送
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皮皮学刷刷变学霸
举一反三
【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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