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【单选题】
设A为m×n矩阵，且m＜n，若A的行向量线性无关，则( )．A.
方程组AX=B有无穷多解
B.
方程组AX=B仅有惟一解
C.
方程组AX=B无解
D.
方程组AX=B仅有零解
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举一反三
【单选题】interdisciplinary
A.
adj. 各学科间的;跨学科的
B.
n. 跨学科，多种学科；交叉学科
C.
vt. 训练，训导；惩戒
D.
n. 禁止，制止；封锁
【单选题】In the writer's opinion, interdisciplinary studies are important because they______.
A.
encourage scholars to concentrate on their own specialisations
B.
allow scholars to Change disciplines more easily
C.
make scholars aware of problems outside their own field
D.
allow overworked scholars to relax
【简答题】It is to enjoy your Automatic Blanket: When you are ready to retire, mm the control switch to 'on'. The dial light tells you it's on. Now you are ready to dial the warmth level of your choice. (Most p...
【简答题】有关“守温”声钮,以下说法不对的是A. 帮滂并明属于轻唇音; B. 精清从心邪属于正齿音; C. 见溪群疑属于牙音; D. 来和日分别属于半舌音和半齿音;
【单选题】When do people who retire start collecting Social Security benefits?
A.
Immediately after they retire.
B.
2 months after they retire.
C.
2 years after the normal retiring age.
D.
2 years before they retire.
【简答题】判断CheckBox是否被选择看该控件的 属性为True。
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