A.≥0.9m/s2 B.≥1.0m/s2 C.≤0.75m/s3 D.≥0.6m/s2
A.≥0.9m/s2 B.≥1.0m/s2 C.≥1.2m/s2 D.≥0.6m/s2
A.15 B.20 C.25 D.10