We are prepared to accept payment by confirmed, irrevocable L/C available by draft at sight instead of T/T reimbursement.(英译中)

题目
We are prepared to accept payment by confirmed, irrevocable L/C available by draft at sight instead of T/T reimbursement.(英译中)


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  • 第1题:

    We _____ like coffee before_____ all.

    A.don’t … at

    B.didn’t … at

    C.didn’t … in

    D.don’t ...in


    答案:B

  • 第2题:



    B. u(t) =-l(t-1)+2 * l(t-2)-l(t-3)V
    C. u(t) = l(t-1)-l(t-2)V
    D. u(t) =-l(t+1)+l(t+2)-l(t+3)V


    答案:B
    解析:
    提示:信号可以用函数来描述,此信号波形是伴有延时阶跃信号的叠加构成。

  • 第3题:

    拉氏变换齐次性表达式是(),A为常数。

    A.L[f(t)]=1/AL[f(t)]

    B.L[Af(t)]= AL[f(t)]

    C.L[Af(t)]= AL[Af(t)]

    D.L[Af(t)]=L[f(At)]


    L[Af(t)]= AL[f(t)]

  • 第4题:

    What are three examples of a provider-provisioned VPN supported by JUNOS software? ()

    A. L2F

    B. PPTP

    C. Circuit cross-connect

    D. Draft-Martini-based VPNs

    E. Draft-Kompella-based VPNs


    参考答案:C, D, E

  • 第5题:

    模拟信号U(t)的波形图如图所示,它的时间域描述形式是:

    (A)u(t) = 2(1-e-10t)?l(t)
    (B)u(t) = 2(1-e-0.1t)?l(t)
    (C)u(t) = [2(1-e-10t)-2]?l(t)
    (D)u(t) = 2(1-e-10t)?l(t)-2?l(t-2)


    答案:D
    解析:
    解:选D。
    概念题目。

  • 第6题:

    1、拉氏变换齐次性表达式是(),A为常数。

    A.L[f(t)]=1/AL[f(t)]

    B.L[Af(t)]= AL[f(t)]

    C.L[Af(t)]= AL[Af(t)]

    D.L[Af(t)]=L[f(At)]


    L[Af(t)]= AL[f(t)]