nguyenthilan78978978 nguyenthilan78978978

04-01-2024
Computers and Technology

contestada

đá cắt trong máy cắt được làm từ vật liệu gì vì sao?

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rigobertosanchez260 rigobertosanchez260

04-01-2024

Corundum thường được dùng để làm bột mài, từ giấy mài tới các máy lớn trong gia công kim loại cơ khí, gỗ và nhựa. Một vài dạng emery là hỗn hợp ...

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