一般来说,行车中()左右的有效信息是靠视觉获得的,所以视觉特性对安全行车有重大影响。
A.30%
B.60%
C.90%
参考答案:C
You needn’t go to the railway station by taxi because it is within walking ________.It only takes five minutes to walk there.
A.touch
B.distance
C.speed
D.reach
目前井下蓄电池机车的电源装置为()型。
A、增安型
B、防爆特殊
C、本质安全型