[名词解释] 分蜜效率

高压直流输电系统的运行方式包括（）。 ["单极大地回路","单极金属回路","双极回路","双极大地回路"] SQL更新语句 商业印刷包括（） ["书刊出版","报纸生产","商业表格","证券","邮票"] 凹凸压印工艺流程为（） ["塞橡皮","制凹面模版","翻制凸面模版","装版","压印"] S-CCPCH是单向下行信道，固定使用（）的扩频因子. ["SF=1","SF=4","SF=8","SF=16"] 分蜜效率