... SIZE BOLTS 不鏽鋼小螺絲STAINLESS STEEL SHEET METAL SCREWS 不鏽鋼大螺絲STAINLESS STEEL BOLTS 銅螺絲BRASS...
分類：電腦與網際網路 > 軟體 2009年03月07日
... into a diestock to cut threads on screws or bolts. 4. A part on a machine that... holes in, cuts, or forms sheet metal , cardboard, or other stock. 5. A metal block ...
(1) 決定下列分子的點群： a. 乙烷（交錯式構象） b. 乙烷（重疊式構象） c. 氯化乙烷（交錯式構象） d. 1,2-二氯乙烷（交錯反式構象） (2) 決定下列分子的點群： a. 乙烯 b. 氯化乙烯 c. 所有可能的二氯乙烯異構物 (3) 決定下列分子的點群： a. 乙炔 b. H─C三C...
...brass with tin becomes admiralty brass; Muntz metal with tin is called naval brass. 含錫的彈筒殼...high machinability is required, as with automatic screw machine stock, 2 to 3% lead is added to the brass...
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