形成二次以上的高次群的方法通常有PCM复用和数字复接两种。所谓PCM复用就是()。数字复接是将几个低次群在()上迭加合成高次群。
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In order to prevent a person()general average contribution on the ground that he was at fault,the fault must be something which constitutes an actionable wrong.
A. to recover
B. to be recovered
C. being recovered
D. recovering