double magnetic track 中文意思是什麼
double magnetic track
解釋
雙磁軌-
L yb - 7442 four - trace double - track recording and playing magnetic heads has won grade two award for science and technology advancement of shenzhen city
Rp - 7442四跡雙道錄放磁頭獲得深圳市科學技術進步二等獎
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