重型轨道车的小修是指每行驶()—()km,必须对走行及制动系统等部件进行修理和更换。
参考答案:6000、8000
Can you tell me ______? [ ]
A. how much does it cost
B. how much is it
C. how much it costs
雷锋三次被评为先进工作者,()次被评为红旗手,十八次被评为标兵。
A.三
B.四
C.五
D.六