Optimum line length of sight  最佳视线长度

optimum proportion  最佳配比; 合理配比; 最佳比例

optimum proportion of asphalt  最佳油石比

optimum proportion of asphalt to aggregate  最佳油石比

optimum proportion of matrix  基质配方优化

Double line-line voltage control  双电压控制

line-line extreme distance  线-线极限距离

line-line topological relation in traffic network  交通网络线-线拓扑关系

on-line line loss  在线线损

loss-free line (=lossless line =lossless transmission line)  无耗损线

SDSL Single-Line Digital Subscriber Line，Single-Line DSL  单绞线数字用户系统; 对称数字用户回路

Fishing boat optimum main engine optimum auxiliari  渔船; 最适辅机; 最适主机; 甲乙种燃油掺配

to approach the optimum from non-optimum  从非优到优

10-line to 4-line BCD encoder  十进制至8421码编码器

A line used as both sterile and maintaining line  一系两用

agonic line {agonic line of no declination}  无磁差线; 无偏线

cytoplasmic male sterile line CMS-line  质核互作型雄性不育系

double line to line voltages  双电压

double line-to-line voltage control  双电压控制