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【单选题】
某高校的管理系统中有学生关系为：学生(学号，姓名，性别，出生日期，班级)，该关系的数据是在高考招生时从各省的考生信息库中导入的，来自同一省份的学生记录在物理上相邻存放，为适应高校对学生信息的大量事务处理是以班级为单位的应用需求，应采取的优化方案是______。
A.
将学号设为主码
B.
对学号建立UNIOUE索引
C.
对班级建立CLUSTER索引
D.
对班级建立UNIOUE索引
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【单选题】The figure shows a graph of the market for pizzas in a large town. If the price falls from $10 to $7 per pizza, the quantity of pizzas demanded will
A.
increase by 20.
B.
increase by 30.
C.
decrease by 30
D.
decrease by 10.
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【单选题】The figure shows that the maximum amount a person is willing to pay for the 400th pretzel
A.
is greater than the marginal social cost of the 400th pretzel.
B.
is less than the marginal social benefit of the 400th pretzel.
C.
and the marginal social benefit of the 400th pretzel are both $2.
D.
is greater than the marginal social benefit of the 200th pretzel.
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【多选题】下列各项记账方法中,属于复式记账法的有( )。
A.
借贷记账法
B.
增减记账法
C.
收付记账法
D.
单式记账法
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【单选题】The figure shows a proton in a magnetic field. For which of the three proton velocities shown will the magnetic force be greatest?
A.
(a)
B.
(b)
C.
(c)
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【单选题】He works very ().
A.
hard
B.
hardly
C.
harder
D.
harded
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【多选题】下列各项中属于会计核算方法的有( )。
A.
复式记账
B.
填制和审核会计凭证
C.
登记账簿
D.
编制会计报表
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【单选题】The figure shows a linear (straight-line) demand curve. Starting at point A and then moving to point B and then point C, the price elasticity of demand
A.
increases.
B.
decreases.
C.
increases and then decreases.
D.
decreases and then increases.
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【单选题】The figure shows a graph of the market for pizzas in a large town. No pizzas will be demanded unless price is less than
A.
$14.
B.
$0.
C.
$5.
D.
$12.
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【多选题】企业记入“管理费用”的税金有( )。
A.
土地增值税
B.
印花税
C.
房产税
D.
耕地占用税
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【简答题】Mr. Smith 36 from London. Now he is in China. He is 37 .He teaches 38  a middle school. He works very hard. His students like  39 very much. He can 40  a little Chinese. His students often teaches h...
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相关题目：
【单选题】The figure shows a graph of the market for pizzas in a large town. If the price falls from $10 to $7 per pizza, the quantity of pizzas demanded will
A.
increase by 20.
B.
increase by 30.
C.
decrease by 30
D.
decrease by 10.
查看完整题目与答案
【单选题】The figure shows that the maximum amount a person is willing to pay for the 400th pretzel
A.
is greater than the marginal social cost of the 400th pretzel.
B.
is less than the marginal social benefit of the 400th pretzel.
C.
and the marginal social benefit of the 400th pretzel are both $2.
D.
is greater than the marginal social benefit of the 200th pretzel.
查看完整题目与答案
【多选题】下列各项记账方法中,属于复式记账法的有( )。
A.
借贷记账法
B.
增减记账法
C.
收付记账法
D.
单式记账法
查看完整题目与答案
【单选题】The figure shows a proton in a magnetic field. For which of the three proton velocities shown will the magnetic force be greatest?
A.
(a)
B.
(b)
C.
(c)
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【单选题】He works very ().
A.
hard
B.
hardly
C.
harder
D.
harded
查看完整题目与答案
【多选题】下列各项中属于会计核算方法的有( )。
A.
复式记账
B.
填制和审核会计凭证
C.
登记账簿
D.
编制会计报表
查看完整题目与答案
【单选题】The figure shows a linear (straight-line) demand curve. Starting at point A and then moving to point B and then point C, the price elasticity of demand
A.
increases.
B.
decreases.
C.
increases and then decreases.
D.
decreases and then increases.
查看完整题目与答案
【单选题】The figure shows a graph of the market for pizzas in a large town. No pizzas will be demanded unless price is less than
A.
$14.
B.
$0.
C.
$5.
D.
$12.
查看完整题目与答案
【多选题】企业记入“管理费用”的税金有( )。
A.
土地增值税
B.
印花税
C.
房产税
D.
耕地占用税
查看完整题目与答案
【简答题】Mr. Smith 36 from London. Now he is in China. He is 37 .He teaches 38  a middle school. He works very hard. His students like  39 very much. He can 40  a little Chinese. His students often teaches h...
查看完整题目与答案