BLACK ACETAL COPOLYMER, MCMASTER-CARR P/N 8497K111 OR EQUIVALENT8 w; ~% A* X' M t3 u 6 n$ T- {0 Z+ M: w 是黑色乙縮醛樹脂?能用黑色POM代替? 那串是什么代碼?何解?$ i6 t' H9 t$ d . h0 z4 u: k- n+ B 求大俠們幫忙解釋,謝謝 |
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