答案:A
A. 0.1
B. 0.2
C. 0.5
D. 1
A. 1
B. 2
C. 3
D. 4
A. 0.8m,0.6m
B. 1.0m,0.8m
C. 1.0m,0.6m
D. 0.8m,0.5m