flat head thread cutting（“F” point) tapping screw 12#*1" (25.4) 另附上图纸12#表示的是美制的番号吗?相当于我国的什么,请说的详细些,因为我不是很懂这个,客人的图纸只标了上面的那句话,

请问机械加工中relief cut和threadrelief cut 和thread relief 指的是什么呢? cut off one's head翻译下 they cut offf king's head? “go ahead!or?cut you head~ go ahead!or?cut you head~ flat head thread cutting（“F” point) tapping screw 12#*1 (25.4) 另附上图纸12#表示的是美制的番号吗?相当于我国的什么,请说的详细些,因为我不是很懂这个,客人的图纸只标了上面的那句话, 英语翻译1、philip bugle head ,fine thread sharp point drywall screw bright zinc plated2、philip bugle head ,fine thread sharp point drywall screw black phosphate3、philip bugle head ,coarse thread sharp point drywall screw black phosphated cut bear’s head（猜一个英语单词） flat flat flat flat Flat flat Countersunk Flat Head Screw, Countersunk Raised Head Screw, Hex Head Cap Screw分别是什么紧固类型.还有,Hex Head Bolt ,Hex Head Screw, Hex Socket Countersunk Hex Screw ,Hex Socket Head Cap Screw. 句子结构分析She dances on her flat roof.She relaxes by standing on her head. 英语He's cut his head摔倒碟上后说He's cut his headcut在这里怎么解释 officers found Hassan with her head cut off.with her head 在句中充当什么成份?