【单选题】下面关于两类Cauchy问题的等价性说法错误的是( )。
B.
系统的初始能量可以是以往积累的结果,也可以是瞬时冲激脉冲提供。
C.
零初始条件下,冲激输入的效果与一个只靠释放初始内部能量而动作的自由运动系统的效果是一样的。
D.
一个非零初值条件的系统,一定不能用零初始条件系统替代说明问题。
【简答题】光接收机可以分为两种基本类型,()和()
【单选题】They will see ______off.
【多选题】下面关于两类Cauchy问题的等价性说法正确的是( )。
B.
系统的初始能量可以是以往积累的结果,也可以是瞬时冲激脉冲提供。
C.
零初始条件下,冲激输入的效果与一个只靠释放初始内部能量而动作的自由运动系统的效果是一样的。
D.
一个非零初值条件的系统,一定不能用零初始条件系统替代说明问题。
【简答题】阅读理解。 Tom arrived at the bus station quite early for Paris bus. The bus for Paris would n ot leave until five to twelve. He saw a lot of people waiting in the station. Some were standing in line(排队), ...
【单选题】西方列强对中国的侵略,首先和主要的是进行
【简答题】阅读理解。 Tom arrived at the bus station quite early for Paris bus. The bus for Paris would not leave until five to twelve. He saw a lot of people waiting in the station. Some were standing in line(排队), o...