Which three technologies are used to reduce chromatic dispersion accumulation in fiber-optic transmission systems？（） [" PIN photodiodes"," zero-chirped lasers"," Erbium-doped fiber amplifiers"," dispersion compensating fiber"," dispersion compensating Bragg grating"]
如何正确合理地使用化学消油剂？
Which of the following shut down options should not be used before performing a consistent whole database backup？（） ["NORMAL","TRANSACTIONAL","ABORT","IMMEDIATE","INCONSISTENT"]
依法治税必须坚持以马克思主义基本理论为指导，坚持党的领导，具体来说应坚持三项原则，下列不正确的是（）。 ["坚持群众的观点","坚持民主集中制的原则","坚持实践的观点","坚持实事求是的原则"]
Click the Exhibit button. What is the maximum allowable loss budget between the ONS 15216 Mux (left side) composite output and the ONS 15216 Demux (right side) composite input, with the optical values given in the exhibit? （）(Assume the worst case loss of 4.5 dB for 15216 200 GHz Mux/Demux and ignore power penalties or extra margin.) ["15dB","17dB","21dB","26dB","27dB"]
凡是可能引起保护装置（）的一切工作，运行人员必须（）防止保护误动的（）措施。
