A.
B.
C.
D.
[单选题]A.2.4B.11.5C.23.1D.29.4
[单选题]A.a塑性好,b强度高,c刚度大B.a强度高,b刚度大,c塑性好C.a塑性好,b刚度大,c强度高D.a强度高,b塑性好,c刚度大
[单选题]A.2.4B.11.5C.23.1D.29.4
[单选题]A.a塑性好,b强度高,c刚度大B.a强度高,b刚度大,c塑性好C.a塑性好,b刚度大,c强度高D.a强度高,b塑性好,c刚度大
[单选题]A.0.994B.0.504C.0.006D.0.944
[单选题]A.0.994B.0.504C.0.006D.0.944
[单选题]A.0.994B.0.504C.0.006D.0.944
[单选题]A.a塑性好,b强度高,c刚度大B.a强度高,b刚度大,c塑性好C.a塑性好,b刚度大,c强度高D.a强度高,b塑性好,c刚度大