【简答题】Let children learn to judge their own work. A child doesn ’ t learn to talk by being corrected all the time. If he is corrected too much, he will stop talking. He notices a thousand times a day the di...
【简答题】Laminar—or streamline—flow moves through a system in thin cylindrical layers of liquid flowing in fashion. This type of flow will have little if any (swirling or eddying) in it. Laminar flow usually e...