答案:B
A. ±2%
B. ±4%
C. ±200mm
D. ±100mm
解析:GB38900-2020B.4.2.2
解析:侧面的车身反光标识长度应大于等于车长的50%
A. 4%
B. 5%
C. 6%
D. 7%