In order to maintain the reach of a typical 100G WAN transport system(~1500km), several system improvements have to be made to recover the lost (93)，including the use of low-loss low-nonlinearity(94)，Raman amplification,and stronger error correction.

A．noise

B．SNR

C．speed

D．error

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[单选题]（ ） are those made out to consignees with the words“to the order of ×××”or

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[主观题]how do you maintain emergency battery ?