回弯头翻边部分的角度允许误差为（）。
A、±0.2°
B、±0.4°
C、±0.5°
D、±0.6°
参考答案：C
Many writers give the supreme praise to mother love, which always is considered . [ ]
A. heartbreaking
B. lovely
C. emotional
D. unconditional
（）是知识经济发展的基础
