The following factors are not the most obvious factors affecting the driving safety of road surface:（）
A. flatness
B. skid resistance
C. drainage
D. friction
查看答案
Collect information about which traffic flow features.（）
A. flow rate
B. vehicle speed
C. queue length
D. running time
The specified number of highway lanes is（）and（）respectively
A. Class III Highway
B. Class I Highway
Class IV Highway
D. Class II Highway
Pour obtenir la valeur ajoutée brute, on fait ce calcul（）
A. Valeur de la production – Consommations intermédiaires
B. Valeur de la production + Consommations intermédiaires
C. Valeur de la production×Consommations intermédiaires
D. Valeur de la production / Consommations intermédiaires
The following are passive safety measures.（）
A. safety bodies
B. safety seats
C. seat belts
D. vehicle brake safety device
微信支付 
支付宝支付