问题描述：
[多选]
为保证系统的全程功率控制，中兴ZXWM M900 DWDM系统采用了哪些功率控制技术？To ensure the whole-process power control of the system， the ZXWM M900 DWDM system adopts which of the following power control technologies？（）
A．功率预均衡;Power pre-balancing
B．增益平坦;Gain flattening
C．可调增益斜率EDFA ; adjustable gain slop EDFA
D．APSD和APR技术; APSD and APR technologies
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上一篇：DWDM网元复用段保护组APS属性配置中包含The APS property configuration in the multiplex section protection group of a DWDM NE includes（）
下一篇：某干线A—B为超长距无电中继系统，共计22个跨段，全长1600km。开通过程中现场出现信噪比较低、信噪比平坦度较差现象，可以采用哪些处理来改善这些指标（）A trunk line from A to B utilizes ultra-long non-electrical regenerator DWDM system， covers 22 spans and is totally 1600 km long． During the system commissioning， it is found that the signal noise rate （SNR） is low and the flatness of SNR is poor． Which of the following measures can be taken to optimize these indices？（）
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