单项选择题
A.30km/h B.55km/h C.60km/h D.70km/h
A.0.9m/s2 B.1.0m/s2 C.1.1m/s2 D.1.2m/s2
A.12t B.14t C.16t D.18t
A.40mm B.50mm C.60mm D.70mm
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