鼻泪管开口破膜术
operation of Hasner valve incision
处壁开管柱
wall treated open tubular column
多孔层开管柱
porous layer open tubular columns
carbon molecular sieve
Porous _ layer open tubular column
Plot column
反向触发双极晶闸管开关
reversely switched dynistor
集热管的真空开管装置
vacuum opener for all-glass evacuated collector tubes
脊髓中央管开口
Opening of Central canal of spinal cord