学生搞清了这个问题,老师顺势转入正题: 刚才我们看到闸门的提升和下降,通过闸门的水量就随着增大或减少。单位时间内的过水量,就叫做水的“流量”,人们一般用“立方米/秒”作单位。我们还看到,闸门过水量的增加与减少还决定江面水位的高低,说明上游江 Students figure out this problem, the teacher took the opportunity to go to the topic: just now we see the gate to enhance and decline, as the amount of water through the gate increases or decreases. Water per unit of time, called the water “flow”, people generally use “cubic meters / second” for the unit. We also see that the increase and decrease of water flow in the gate also determines the level of water level in the river surface,