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[多选] 下列哪里项属于优质蛋白质
A．牛奶 B．肉类
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随机题目

对于只使用G．652光纤的系统，使用NRZ编码方式时，残余色散应遵循欠补偿原则，以下说法正确的是？（）For the system that only uses the G．652 fiber， the principle of under-compensation should be followed for the residual dispersion in the case of NRZ encoding mode． Which of the following statements about the principle are true？（）
为了调平WDM系统各功率点的功率平坦度，可以利用系统中存在的功率调节单板（）。 Which of the following power modulation boards of the system can be used to optimize the power flatness at different nodes of the WDM system？（）
导致光传输系统中通道功率的不平衡的原因有（）Which of the following factors may lead to channel power imbalance in the optical transmission system？
对于ZXWM M900设备组成的80波长距离系统，系统调试时如果发现非线性效应非常严重，下面哪些那操作可以减轻非线性效应带来的影响（）For the 80-wavelength-distance system that is made up of ZXWM M900 equipment， if non-linear effect is detected to be very serious during the system commissioning， which operations below can be used to alleviate the influence of the non-linear effect？（）
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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