Trace Nb微量铌
tracen.痕迹;微量;踪迹v.追踪;描绘;找出根源
trace element characteristics微量元素特征
trace and ultra trace elements痕量超痕量元素
Traceable mangement technology溯源技术
trace and slight precipitation痕量和微量降水
traceability of quantity values量值溯源
trace polychlorinated biphenyls痕量多氯联苯
traces of prehistoric habitation史前居民的遗迹
Tracey's birthday was in June.
trace system of epidemic disease疫病可追溯体系
Trace elements for coarse powder粗钨粉杂质元素含量