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【单选题】
设A为m×n矩阵，齐次线性方程组Ax＝0仅有零解的充分条件是A.
A的列向量线性无关．
B.
A的列向量线性相关．
C.
A的行向量线性无关．
D.
A的行向量线性相关．
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【单选题】Most people who like coffee _______ .
A.
drink it without milk or sugar
B.
get it at coffee bars
C.
drink instant coffee
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【简答题】中国古典园林的构景手段有哪些？
【单选题】Most people in the mountains of Eduador drink a lot of coffee and alcohol, but they still live long.
A.
Right
B.
Wrong
【单选题】This passage can be most likely to be entitled
A.
The Birthplace of Coffee.
B.
The Effect of Coffee.
C.
The History of Coffee.
D.
The Popularity of Coffee.
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【单选题】关于氩气瓶的说法错误的是( )。
A.
在20°C以下，满瓶装氩气压力为15 MPa
B.
氩气瓶在使用中严禁敲击、碰撞
C.
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D.
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