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【判断题】
基于“雇员”表查找所有“女”雇员的关系运算属于“投影”。
A.
正确
B.
错误
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参考答案：
举一反三
【简答题】思想的演进和技术的进步，深刻影响了人类文明的发展。阅读下列材料 材料一 人是一件多么了不起的杰作！多么高贵的理性！多么伟大的力量！多么优美的仪表！多么文雅的举动！在行为上多么像一个天使！在智慧上多么像一个天神！宇宙的精华！万物的灵长！ ──《哈姆雷特》中主人公哈姆雷特的—段独白 材料二 人生下来就是自由的，人可以说是自由的动物。那么，人民的自由虽可以用法律加以保障，但它原是天所赐予的，为...
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【多选题】Copyrights are exclusive legal rights of _________________ to publish and dispose of their work as they see fit.
A.
composers
B.
artists
C.
authors
D.
publishers
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【单选题】The idea that government should regulate intellectual property through copyrights and patents is relatively recent in human history, and the precise details of what intellectual property is protected ...
A.
Countries may differ in their efforts to protect it.
B.
The author considers its protection well-grounded.
C.
People believe its protection may benefit creators.
D.
The history of its protection has not been long.
查看完整题目与答案
【单选题】The idea that government should regulate intellectual property through copyrights and patents is relatively recent in human history, and the precise details of what intellectual property is protected ...
A.
Countries may differ in their efforts to protect it.
B.
The author considers its protection well-grounded.
C.
People believe its protection may benefit creators.
D.
The history of its protection has not been long.
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【简答题】Copyrights
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【单选题】已知Al为正三价，阿伏加德诺常数为6.02×10∧23（10的23次方），铝摩尔量为26.98，质量1g的Al中的价电子数量为（ ）。
A.
6.69×10∧21 （10的21次方）
B.
6.69×10∧22 （10的22次方）
C.
6.69×10∧23 （10的23次方）
D.
6.69×10∧24（10的24次方）
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【单选题】有孔毛细血管存在于
A.
肌组织
B.
中枢神经系统
C.
肺
D.
骨髓
E.
胃肠黏膜
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【单选题】有孔毛细血管存在于
A.
肌组织
B.
中枢神经系统
C.
肺
D.
胃肠粘膜
E.
脾
查看完整题目与答案
【判断题】糖精在所有天然甜味剂中甜味最强。
A.
正确
B.
错误
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【简答题】He ________ your car by mistake because he didn't have the keys. A．mustn't have taken B．shouldn't have taken C．couldn't have taken D．needn't have taken
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相关题目：
【简答题】思想的演进和技术的进步，深刻影响了人类文明的发展。阅读下列材料 材料一 人是一件多么了不起的杰作！多么高贵的理性！多么伟大的力量！多么优美的仪表！多么文雅的举动！在行为上多么像一个天使！在智慧上多么像一个天神！宇宙的精华！万物的灵长！ ──《哈姆雷特》中主人公哈姆雷特的—段独白 材料二 人生下来就是自由的，人可以说是自由的动物。那么，人民的自由虽可以用法律加以保障，但它原是天所赐予的，为...
查看完整题目与答案
【多选题】Copyrights are exclusive legal rights of _________________ to publish and dispose of their work as they see fit.
A.
composers
B.
artists
C.
authors
D.
publishers
查看完整题目与答案
【单选题】The idea that government should regulate intellectual property through copyrights and patents is relatively recent in human history, and the precise details of what intellectual property is protected ...
A.
Countries may differ in their efforts to protect it.
B.
The author considers its protection well-grounded.
C.
People believe its protection may benefit creators.
D.
The history of its protection has not been long.
查看完整题目与答案
【单选题】The idea that government should regulate intellectual property through copyrights and patents is relatively recent in human history, and the precise details of what intellectual property is protected ...
A.
Countries may differ in their efforts to protect it.
B.
The author considers its protection well-grounded.
C.
People believe its protection may benefit creators.
D.
The history of its protection has not been long.
查看完整题目与答案
【简答题】Copyrights
查看完整题目与答案
【单选题】已知Al为正三价，阿伏加德诺常数为6.02×10∧23（10的23次方），铝摩尔量为26.98，质量1g的Al中的价电子数量为（ ）。
A.
6.69×10∧21 （10的21次方）
B.
6.69×10∧22 （10的22次方）
C.
6.69×10∧23 （10的23次方）
D.
6.69×10∧24（10的24次方）
查看完整题目与答案
【单选题】有孔毛细血管存在于
A.
肌组织
B.
中枢神经系统
C.
肺
D.
骨髓
E.
胃肠黏膜
查看完整题目与答案
【单选题】有孔毛细血管存在于
A.
肌组织
B.
中枢神经系统
C.
肺
D.
胃肠粘膜
E.
脾
查看完整题目与答案
【判断题】糖精在所有天然甜味剂中甜味最强。
A.
正确
B.
错误
查看完整题目与答案
【简答题】He ________ your car by mistake because he didn't have the keys. A．mustn't have taken B．shouldn't have taken C．couldn't have taken D．needn't have taken
查看完整题目与答案
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