农用车行驶中 ,有些现象初看似乎自相矛盾 ,有悖常理 ,其实个中蕴藏着不少科学道理 ,现举几个例子加以说明 :１．热车比冷车难启动。柴油发动机有时会出现在热状态下反而比冷状态更难启动的现象。造成这种反常现象的根本原因是发动机容易过热 ,而冷却系统无法及时散热 ,从而引 Some phenomena of agricultural vehicles driving at first glance seem to be self-contradictory and perverse. In fact, there are many scientific truths contained in them. Here are a few examples to illustrate: 1. A hot car is harder to start than a cold car. Diesel engines sometimes appear to be more difficult to start in hot conditions than cold ones. The root cause of this anomaly is that the engine is prone to overheating and the cooling system can not dissipate heat in time,