A.0.9m,1.1m
B.1.05m,1.1m
C.1.0m,1.1m
D.1.05m,1.2m
A.0.9m,1.1m
B.1.05m,1.1m
C.1.0m,1.1m
D.1.05m,1.2m
A.1.05m
B.1.10m
C.1.20m
D.1.30m
A.1.05m
B.1.10m
C.1.20m
D.1.30m
A.0.5
B.0.7
C.1
D.2
A.800
B.900
C.1200
D.1050
A.0.5
B.0.7
C.1
D.2
A.900毫米
B.1000毫米
C.1100毫米
D.1200毫米
A.σ钢=σ铜,Δl钢<Δl铜
B.σ钢=σ铜,Δl钢>Δl铜
C.σ钢>σ铜,Δl钢<Δl铜
D.σ钢<σ铜,Δl钢>Δl铜
A.4 倍
B.2 倍
C.1/4
D.1/8