【单选题】Let x[n] be an absolutely summable signal with rational z-transform X[z].If X[z] is known to have a pole at Z=1/3, please determine the which statement is True. ( )
A.
x[n] may be a finite-duration signal.
B.
x[n] may be a left-sided signal
C.
x[n] may be a right-sided signal.
D.
x[n] may be a anticausal signal
【单选题】下面标点错误的是:
A.
这些化学药品不应该称作“杀虫药剂”,而应称为“杀生物药剂”。
B.
“你难道看不出我也许跟这事有点牵连吗?”苏比说,口气虽然带点嘲讽,却很友善,仿佛好运在等着他。
C.
也有的播迁他帮、重振雄风,也有的是昙花一现,未老而先亡。
D.
在文字上推敲,骨子里实在是在思想感情上“推敲”。
【单选题】Let x[n] be an absolutely summable signal with rational z-transform X[z].If X[z] is known to have a pole at Z=3, please determine the which statement is True. ( )
A.
x[n] may be a finite-duration signal.
B.
x[n] may be a left-sided signal.
C.
x[n] may be a right-sided signal
D.
x[n] may be an anticausal signal
【简答题】写出以下代码的输出的结果 let a={n:1} let b=a; a.x=b console.log(b.x.x.n);//此处输出结果为:______________
【简答题】劳动过程中的职业性有害因素,按其性质可分为以下四大类: 、 、 、 。
【简答题】Let {X i ,i=1,...,n} be n i.i.d. observation on X and let {Y i ,i=1,...,n} be the associated order statistics. (1)Show that . (2)Show that . (3)Show that
【单选题】Let A be an n n matrix with . If , then .