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【单选题】
已知非零向量e 1 ,e 2 ,a,b满足a=2e 1 -e 2 ,b=ke 1 +e 2 .给出以下结论: ①若e 1 与e 2 不共线,a与b共线,则k=-2; ②若e 1 与e 2 不共线,a与b共线,则k=2; ③存在实数k,使得a与b不共线,e 1 与e 2 共线; ④不存在实数k,使得a与b不共线,e 1 与e 2 共线. 其中正确结论的个数是( )A.
1个
B.
2个
C.
3个
D.
4个
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反馈参考答案：
举一反三
【单选题】He didn't answer me, ________, he asked me another question.
A.
as a result
B.
instead of
C.
instead
D.
therefore
【单选题】Though he didn't answer my questions quickly, the look on his face ___________ that he was satisfied with me.
A.
indicated表明
B.
input
C.
increased
D.
interacted
【简答题】Though he didn't answer my questions
quickly, the look on his face ___________ that he was satisfied with me.A. indicated B. input C. increased D. interacted
【单选题】Though he didn't answer my questions quickly, the look on his face ___________ that he was satisfied with me.
A.
indicated
B.
input
C.
increased
D.
interacted
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