单词	中心冲
释义	中心冲center punch
随便看	back-to-back coupling，b-b back-to-back credit export first back-to-back credit import first back-to-back device back-to-back devices back-to-back ionization back-to-back ionization chamber back-to-back ionization--chamber back to back l/c back-to-back [letter of] credit back to back loan back-to-back loan back-to-back method back-to-back mounting back to back repeater back-to-back running back to back sawtooth wave back-to-back starting back-to-back synchronous starting back to back (test) back-to-back test back-to-back testing back-to-back(ticket) back to back tug back to back with