皮皮学，免费搜题
登录
搜题
【多选题】
下面关于建模和模型说法正确的是( )。A.
无论是何种系统,其模型均可用来提示规律或因果关系
B.
建模实际上是通过数据、图表、数学表达式、程序、逻辑关系或各种方式的组合表示状态变量、输入变量、输出变量、参数之间的关系
C.
为设计控制器为目的建立模型只需要简练就可以了
D.
工程系统模型建模有两种途径,一是机理建模,二是系统辨识
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】The study of trees, branches and roots shows that __________.
A.
there were larger amounts of gold in the branches than in the seeds
B.
there were smaller amounts of gold in the roots than in the branches
C.
there were less amounts of gold in the seeds growing on the ends of branches than seeds growing nearest to the tree trunks
D.
there was more gold in the branches than in the roots
参考解析：
知识点：
题目纠错 0
发布
