A.規(guī)定非比例延伸率為20%時(shí)的應(yīng)力 B.規(guī)定比例延伸率為20%時(shí)的應(yīng)力 C.規(guī)定非比例延伸率為0.2%時(shí)的應(yīng)力 D.規(guī)定比例延伸率為0.2%時(shí)的應(yīng)力
A.2.1 B.2.9 C.3.4 D.3.7
A.≥6% B.≥8% C.≥12% D.≥15%