美国: the United States of America ...标准: standard; criterion; benchma ...正规: regular; standard; normal符号: character; sign; symbol; mar ...螺纹: screw thread; flight; helica ...美国标准螺纹符号: asa thread symbol美国标准简化符号(螺纹): antarctic circle螺纹正规符号书法(美式): alternate light and heavy line method美国标准螺纹: american nation thread; american national screw thread; american standard screw thread; american standard thread; ast; united states standard screw thread美国标准符号: asa svmbol美国标准粗牙螺纹: national conarse美国标准管螺纹: american standard pipe thread美国标准螺钉螺纹: us standard screw thread美国标准细牙螺纹: national fine美国标准直管螺纹: nps american standard straight pipe thread美国标准锥管螺纹: npt american standard taper pipe thread标准正规化: standard normalization标准正规值: standard normal value美国标准螺纹, 塞勒螺纹: united states standard screw thread美国标准螺纹配合等级: american screwthread class美国标准协会管螺纹: american standard association pipe threads; asa pipe threads美国标准协会式螺纹: asa thread美国标准: am.std; amer std(am std，american standard); amer-std = american standard; as = american standard; astm; ss nited states standad; u united states standard; united states standards; uss united states standard美国标准fortran: asa fortran美国标准本: asv
