• 2022-05-28
    [As recently as 1993],engineers made a (major) breakthrough [by discovering so-called turbo codes(turbo 码)]---(which come very close to Shannon’s ultimate limit for the maximum rate (最大速度极限))(that data can be transmitted reliably), and now play a key role in the mobile videophone(可视电话) revolution.The clause (从句)introduced by “which” is a ( ) clause(从句).
    A: appositive clause(同位语从句)
    B: non-restrictive attributive clause(非限定性定语从句)
    C: adverbial clause(状语从句)
    D: restrictive attributive clause(限定性定语从句)