算术控制
Ways to increase precision, such as arithmetical mean and implant control point, were studied and their principles and characters were analyzed and discussed.───研究了算术平均值法、加入控制点法等多种提高精度的方法，分析和讨论了其原理和特点。
numerical control───[自]数字控制；数值控制
biological control───生物防治；[生物物理]生物控制
numerical controls───[自]数字控制；数值控制
automatic gain control───[电子]自动增益控制
automatic gain controls───[电子]自动增益控制
air traffic control───空中交通管制；空中交通管制队
air-traffic control───空中交通管制；空中交通管制队