能表达控制系统各变量之间关系的数学表达式或表示方法,叫系统的数学模型,在古典控制理论中系统数学模型有微分方程、()等
参考答案:传递函数
向日葵的花盘随着太阳转动,一滴汤水会招来许多的蚂蚁,这些现象说明生物具有哪一特征 [ ]
A.生长
B.应激性
C.反射性
D.新陈代谢
_____, Carolina couldn't get the door open. [ ]
A. Might she as try
B. As she might try
C. She might as try
D. Try as she might