A.2.8m
B.0.4m
C.2.4m
D.3.2m
[单选题]A.1B.0.632C.0.5D.0.264
[单选题]A.PVC塑料或陶瓷B.L1铝材C.铜材D.Q-235A
[单选题]A.B.C.减小垢层D.减小管壁厚度
[单选题]A.B.C.D.
[单选题]A.56.25%B.43.75%C.77.78%D.22.22%
[单选题]A.12.54%B.13.24%C.13.46%D.14.36%
[单选题]A.B.C.D.无法确定