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【判断题】
线应变和切应变是度量构件内一点处变形程度的两个基本量,它们都是量纲为1的量,切应变的单位是rad(弧度)。A.
正确
B.
错误
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【单选题】Egypt 's influence in the region has been gradually changing; Saudi Arabia ,an oil rich county, is now the domineering force.
A.
This is a correct sentence.
B.
This sentence is a run-on sentence.
C.
It's a sentence fragment.
D.
This sentence has a comma splice.
【单选题】The author suggests that the main reason for the persisting influence of Bachofen's work is that ______.
A.
feminists have shown little interest in ancient societies
B.
Bachofen's knowledge of Amazonian culture is unparalleled
C.
reliable information about the ancient world is difficult to acquire
D.
historians have been primarily interested in the modern period
【简答题】是周期为N的周期序列，它的傅里叶级数的系数X(k)也是周期为N的周期序列。求 的傅里叶级数的系数 的关系。
【单选题】去掉文本超链接的下划线的方法是 。
A.
a{text-decoration:no underline;}
B.
a{underline:none;}
C.
a{decoration:no underline;}
D.
a{text-decoration:none;}
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