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【单选题】
下列关于关系模型基本性质的描述，错误的是：A.
关系的每一列上，属性值应取自同一值域
B.
同一关系中不能有完全相同的元组
C.
在同一个关系中可以有相同的属性名
D.
在一个关系中行、列的顺序无关紧要
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举一反三
【单选题】I f students don ’ t study their lessons as they were told, will show up quickly when they take an exam.
A.
deficiency
B.
deficit
C.
deficiencies
D.
defect
【多选题】Directions : Fill the blanks by selecting suitable words from the word blank.Each word is marked with a letter. Answer the questions by marking the corresponding letter.( 只需填写单词前的大写字母,不要填写单词 ).
A.
watch
B.
in
C.
mine
D.
running
E.
listens
F.
fantastic
G.
dozen
H.
available
I.
spend
J.
local 1. My mother often ____ to music. 2. I don ’ t ___ TV in the evening. 3. There are not a lot of students in the ____ school. 4. The computer games are____. I spend a lot of time on it every day. 5. Alice, what ’ s this ____ English? 6. There are two boys ____ in the street. 7. Two___police were sent to the spot to keep order after the accident. 8. Good words can touch not only your heart but also____. 9. How do you usually ____ your day? 10. This book is ____ in the village.
【单选题】甲公司经过近一个月的市场调研，并结合自身企业的资源和能力，决定将目标市场定位在某一个区域市场上。下列选项中属于甲公司将要采取的战略的实施条件是( )。
A.
在目标市场上，部分竞争对手采用类似的战略
B.
企业资源和能力有限，难以在整个产业实现成本领先或差异化，只能选定个别细分市场
C.
市场中存在大量的价格敏感用户
D.
消费者的转换成本较低
【多选题】Directions : Fill the blanks by selecting suitable words from the word blank.Each word is marked with a letter. Answer the questions by marking the corresponding letter.( 只需填写单词前的大写字母,不要填写单词 ).
A.
watch
B.
in
C.
mine
D.
running
E.
listens
F.
fantastic
G.
dozen
H.
available
I.
spend
J.
local 1. There are not a lot of students in the ____ school. 2. The computer games are____. I spend a lot of time on it every day. 3. My mother often ____ to music. 4. I don ’ t ___ TV in the evening. 5. How do you usually ____ your day? 6. This book is ____ in the village. 7. There are two boys ____ in the street. 8. Two___police were sent to the spot to keep order after the accident. 9. Alice, what ’ s this ____ English? 10. Good words can touch not only your heart but also____.
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