護套壁厚 的英文怎麼說
中文拼音 [hùtàobìhòu]
護套壁厚
英文
sheath wallthickness-
Railway applications - railway rolling stock cables having special fire performance - thin wall - part 4 : multicore and multipair cables standard wall sheathed
鐵路設施.有專門防火性能的鐵道機車車輛用電纜.薄壁.第4部分:有標準厚度護套的多芯和多對對絞線的電纜Abstract : the paper presented a kind of drilling hole method that adopted direct circulation and percussion drilling, casing and cliff - protection by mud. the method applied in the complex gravel layer which has the trend to emerge cave - in and drop from the drilling wall
文摘:介紹一種在砂卵石地層層厚復雜、孔壁易掉塊、易坍塌的鉆孔的成孔方法? ?正循環回轉與沖擊鉆進、套管與泥漿護壁成孔。
分享友人