A.分級B.同級C.等級D.逐級
A.5000套B.4000套C.3000套D.2000套
A.規(guī)定塑性延伸率0.2%時B.規(guī)定延伸率0.2%時C.規(guī)定總延伸率0.2%時D.規(guī)定斷后伸長率0.2%時
