[单选] Scrambling of SONET signals is done to （）.

A . prevent the leakage of external fiber emissions
B . provide the optical network with the highest level of security possible
C . assure an even distribution of 1's and 0's for extended transmitter life
D . assure an adequate number of transitions for clock recovery at the receiver
E . prevent the receiver from assuming AIS inadvertently when all 0's are received

单缸四冲程柴油机的工作包含有（）。进气冲程。压缩膨胀冲程。排气冲程。 A、B、C全包括。精神分裂症病人的幻觉主要是（）假性幻听。言语性幻听。幻视。内脏幻觉。幻嗅、幻味。评价算法效率的主要指标是（）和（）。 What types of orders are exempt from using the IPCC Express Configuration and Ordering Tool? （） orders for coresident deployments 。 orders for adding more seats 。 orders for upgrading from standard 。 orders with less than five seats 。 all orders require using the IPCC Express Configuration and Ordering Tool&e。电流相位比较式母线差动保护主要由（）元件和（）元件两部分组成。 Scrambling of SONET signals is done to （）.

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[单选] Scrambling of SONET signals is done to （）.

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