单项选择题
为了使发动机可靠点火,作用在火花塞间隙的电压应能达到多少?
未知题型 - Good afternoon. Can I help you with something?- _________
单项选择题 为了使三效催化转化器有较高的转化效率,可燃混合气的过量空气系数应该为:
未知题型 - This book is really interesting. I enjoy it very much.- _________