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【简答题】
1Cr13和Cr12钢的含铬量差不多，但1Cr13属于不锈钢，而Cr12钢为何不能作为不锈钢使用？
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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...
【简答题】Patents, copyrights, trademarks, and goodwill have no physical form, called __ assets.
【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
【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.
【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.
【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）
【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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