单项选择题
A.10~14mmB.12~16mmC.14~18mmD.16~20mm
A.10%B.20%C.30%D.40%
A.140km/hB.160km/hC.200km/hD.250km/h
A.9m/sB.10m/sC.12m/sD.14m/s
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