1. We specialize in making a wide range of ball valves, brass ball, brass ball valve, ball valves accessories, ball valves manufacturers. 基元铁工厂制造铜球铜球阀，球阀，铜球，铜球阀，球阀，不
2. Denote the center of Curvature at by. When the point moves along the plane curve, the trace curve of the point is called the evolute of the curve, denoted by, and is called the involute of the curve. 当点沿曲线移动时，相应的曲率中心的轨迹曲线称为曲线的渐屈线，而曲线称为曲线的渐伸线。
3. Firstly, after comparing linear accelerated curve with the S accelerated curve, the thesis uses the S accelerated curve as the motion curve of feeding motor. 首先，本文对“线性加减速”和“S型加减速”两种运动曲线作了较为全面的对比，最终选择了“S型加减速曲线”作为送料电机的运动曲线。
4. The curve experiment has obtained curve radius of inertia advance curve and static curve; 转弯试验测得了机器鱼惯性前进转弯和静止转弯时的转弯半径；
5. Such, mental the curve of the constant growth in labor structure is " S " curve, and the curve that physical strength drops in labor structure ceaselessly also is " S " curve. 这样，脑力在劳动力结构中的不断增长的曲线是一条“S”曲线，而体力在劳动力结构中的不断下降的曲线也是一条“S”曲线。
