grading ring 中文意思是什麼
grading ring
解釋
均壓環-
Product quality grading of mining high strength ring chain
礦用高強度圓環鏈產品質量分級探討 -
Grading ring, shielding ring, grading and shielding ring
均壓環屏蔽環和均壓屏蔽環
分享友人