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【单选题】
下列各项中，是向量组【图片】线性相关的充要条件的是 ( ).A.
都不时零向量
B.
中至少有一个 向量能够由其余向量线性表示
C.
中至少有两个向量的分量成比例
D.
中至少有一个部分组线性相关
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反馈参考答案：
举一反三
【单选题】________at the restaurant with a wide variety of dishes served before, Bob didn’t want to eat there again.
A.
Having eaten
B.
To eat
C.
Eat
D.
Eating
【简答题】叠装陈列,要求层板上每叠服装的高度一致,为了方便顾客取放,每叠的上方一般至少要留有( )的空间。
【单选题】You didn't eat enough at lunch,did you?
A.
-_____.You see, I'm hungry now.
B.
yes,I did
C.
yes I was
D.
No I didn't
E.
No I wasn't
【单选题】Lily used to eat candies all the time, ____ ? [ ]
A.
didn't she
B.
used she
C.
doesn't her
D.
didn't Lily
【单选题】________ at the cafeteria before, Tina didn’t want to eat there again.
A.
Having eaten
B.
To eat
C.
Eat
D.
Eating
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