Mba dị iche iche n'ụwa nwere aha dị iche iche maka igwe anaghị agba nchara. Ahịa na-akpọkarị China na United States, nke a na-akpọ ọkọlọtọ mba na ọkọlọtọ America.
Usoro 200, usoro 300, na usoro 400 a kpọtụrụ aha n'elu bụ ụkpụrụ America. N'ihi na ụkpụrụ America dị mfe nghọta, a na-akpọkarị ha Ha bụ ụkpụrụ America niile.
Ọkọlọtọ mba ============ American Standard
1cr17mn6ni5n========201
1cr18mn8ni5n========202
0cr18ni9============304
00cr19ni10==========304L
0cr18ni12mo2t=======316Ti
00cr17ni14mo2=====316L
0cr17ni12mo2========316
1cr18ni9ti==========321
0cr18ni10ti=======321
0cr23ni13===========309S
1cr20ni14===========309S
0cr25ni20===========310S
1cr25ni20 =========== 310s
0cr13=============405
1cr13=============410
2cr13=============420
3cr13==============420
4cr3==============430
Oge nzipu: Jan-19-2020