大修后的柴油机在正式使用前进行磨合运转的目的是什么？
参考答案：
磨合的目的是为了改善柴油机各运动部件的工作状况，提高柴油机的运行可靠性和使用使命。
I wanted to know _________, but no one would like to tell me.
A．what did the old man say
B．how did the old man come
C．whether the old man would come
D．who the old man went
机械式气阀传动机构中，凸轮的形状与安装位置决定了气阀的启闭时刻。
