设Zm= {0, 1, 2, …, m - 1}，<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/211f8e3b46b646598e53d85def442786.png" />是模m乘法运算，则(Zm, <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202010/60da1bba21044182aebb1e783993e81f.png" />)是群.

下面的式子哪一个是描述非稳态导热的第二类边界条件（ ）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/e5c09095c9ab4cb1a306ed310492693f.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/9f45cc2e4b664e81818435678aeb5573.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/bba03a54fa5e4b7eaacb1931ebcec58d.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/fd19c6b572144904a5c6411704e7aa1d.png">

下面给出四个对象特性，指出哪些是有自衡能力的对象？（） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/40e2303ae3364532adf365ed49e995d2.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/cde67abe0ddb4e50a91401ee21e216f8.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/d0722b9318274b28ad20b0ad6a61ac52.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/a88889e3d0e34d93906e5a6349e4de15.png">

因子分析的任务是（ ）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/b53b5bcd82b24166baae03d9c9491459.png"/> B: 估计因子得分函数 C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/f7d4e43fd0ea45be95bbb9c688fa2f7a.png"/> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/532d50b4eddd41aca7df1dfde6ad7efc.png"/>

https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/8f51f32645924628b0a48204edad9723.pnghttp://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/8d2c216b52524ff39b166bf193c7d6c0.jpg<br>