题目内容
（请给出正确答案）
[单选题]
A．couldn'tB．wouldn'tC．mustn'tD．shouldn't
A.couldn't
B.wouldn't
C.mustn't
D.shouldn't
查看答案
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.couldn't
B.wouldn't
C.mustn't
D.shouldn't
如果结果不匹配，请 联系老师 获取答案
更多“A．couldn'tB．wouldn'tC．mustn'tD…”相关的问题
—Shall I tell John about it？—No , you ______. I've told him already.
A．needn't
B．wouldn't
C．mustn't
D．shouldn't
When a friend gave Jim a ticket to the game, he______go.
A．couldn't help
B．cannot do but
C．couldn't help but
D．just have to
求下列函数的卷积积分f1(t)*f2(t)： (1)f1(t)=tε(t),f2(t)=ε(t)； (3)f1(t)=f2(t)=e-2tε(t)； (5)f1(t)=tε(t)，f2(t)=e-2tε(t)； (7)f1(t)=ε(t)一ε(t一4)，f2(t)=sin(πt)ε(t)； (9)f1(t)=tε(t一1)，f2(t)=ε(t+3)；
试证：相互独立的正态过程X(t)与Y(t)的和Z(t)=X(t)+Y(t)仍为正态过程，若已知EX(t)=mX(t),EY(t)=mY(t),D(X(t))=DX(t),D(Y(t))=DY(t)试求E[Z(t)]及D[Z(t)]。
