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【单选题】
数据库系统由数据库、(5)和硬件等组成，数据库系统是在(6)的基础上发展起来的。数据库系统由于能减少数据冗余，提高数据独立性，并集中检查(7)，由此获得广泛的应用。数据库提供给用户的接口是(8)，它具有数据定义、数据操作和数据检查功能，可独立使用，也可嵌入宿主语言使用。(9)语言已被国际标准化组织采纳为标准的关系数据库语言。
A.
操作系统
B.
文件系统
C.
编译系统
D.
数据库管理系统
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举一反三
【单选题】Why does Jenny go to the bank?
A.
To open an account.
B.
To transfer some money.
C.
To buy some foreign currency.
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【单选题】Why does David want Jenny to be quick?
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Because many students will choose Ms. Hunter as their teacher.
B.
Because many students like business English.
C.
Because the course will begin soon.
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【单选题】关于胺碘酮的叙述，错误的是（）。
A.
降低窦房结和普肯耶纤维的自律性
B.
减慢普肯耶纤维和房室结的传导速度
C.
延长心房和普肯耶纤维的动作电位时程、有效不应期
D.
阻滞心肌细胞K + 通道
E.
对Na + 、Ca 2+ 通道无阻断作用
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【简答题】Why does Jenny go to the Finance Department?
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【简答题】3. Why does Jenny hope to meet Alice on Saturday?A. Because she is still working now. B. Because she has to go to the post offi ce . C. Because she is busy today. D. Because she doesn’t like going sho...
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【单选题】没有外轮廓及骨骼限制,可单独处理、自由运用的纹样是
A.
适合纹样
B.
二方连续纹样
C.
四方连续纹样
D.
单独纹样
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【单选题】Why does Jenny look worried?
A.
Because she has lost some money.
B.
Because she hasn ’ t got her scholarship payment.
C.
Because she doesn ’ t know how to cash her scholarship payment check.
D.
Because she cannot buy anything with her check.
查看完整题目与答案
【单选题】下列关于胺碘酮的叙述，错误的是（）
A.
降低窦房结和普肯耶纤维的自律性
B.
减慢普肯耶纤维和房室结的传导速度
C.
延长心房肌、心室肌、普肯耶纤维的APD、ERP
D.
阻滞心肌细胞钠、钙及钾通道
E.
对α、β受体无阻断作用
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【单选题】Why does David want Jenny to be quick?
A.
Because many students will choose Ms. Hunter as their teacher.
B.
Because many students like Business English.
C.
Because the course will begin soon.
查看完整题目与答案
【单选题】Why does the author state in line 9 that observations are taken 'just once every twelve hours' ?
A.
to show why the observations are of limited value.
B.
to compare data from balloons and computers,
C.
to give an example of international cooperation,
D.
to indicate that the observations are timely.
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相关题目：
【单选题】Why does Jenny go to the bank?
A.
To open an account.
B.
To transfer some money.
C.
To buy some foreign currency.
查看完整题目与答案
【单选题】Why does David want Jenny to be quick?
A.
Because many students will choose Ms. Hunter as their teacher.
B.
Because many students like business English.
C.
Because the course will begin soon.
查看完整题目与答案
【单选题】关于胺碘酮的叙述，错误的是（）。
A.
降低窦房结和普肯耶纤维的自律性
B.
减慢普肯耶纤维和房室结的传导速度
C.
延长心房和普肯耶纤维的动作电位时程、有效不应期
D.
阻滞心肌细胞K + 通道
E.
对Na + 、Ca 2+ 通道无阻断作用
查看完整题目与答案
【简答题】Why does Jenny go to the Finance Department?
查看完整题目与答案
【简答题】3. Why does Jenny hope to meet Alice on Saturday?A. Because she is still working now. B. Because she has to go to the post offi ce . C. Because she is busy today. D. Because she doesn’t like going sho...
查看完整题目与答案
【单选题】没有外轮廓及骨骼限制,可单独处理、自由运用的纹样是
A.
适合纹样
B.
二方连续纹样
C.
四方连续纹样
D.
单独纹样
查看完整题目与答案
【单选题】Why does Jenny look worried?
A.
Because she has lost some money.
B.
Because she hasn ’ t got her scholarship payment.
C.
Because she doesn ’ t know how to cash her scholarship payment check.
D.
Because she cannot buy anything with her check.
查看完整题目与答案
【单选题】下列关于胺碘酮的叙述，错误的是（）
A.
降低窦房结和普肯耶纤维的自律性
B.
减慢普肯耶纤维和房室结的传导速度
C.
延长心房肌、心室肌、普肯耶纤维的APD、ERP
D.
阻滞心肌细胞钠、钙及钾通道
E.
对α、β受体无阻断作用
查看完整题目与答案
【单选题】Why does David want Jenny to be quick?
A.
Because many students will choose Ms. Hunter as their teacher.
B.
Because many students like Business English.
C.
Because the course will begin soon.
查看完整题目与答案
【单选题】Why does the author state in line 9 that observations are taken 'just once every twelve hours' ?
A.
to show why the observations are of limited value.
B.
to compare data from balloons and computers,
C.
to give an example of international cooperation,
D.
to indicate that the observations are timely.
查看完整题目与答案