您要查找的是不是：
- If a coil has no metal core it has an air core. 如果线圈没有金属芯子，它就有一个空气芯子。
- If a coil has no metal core it has an air core . 如果线圈没有金属芯子，它就有一个空气芯子。
- Through over voltage on-line monitoring device testing, inquire into lightning protection of the reactor with air core. 并通过安装过电压在线监测装置进行测试的方法,初步探讨了空心电抗器防雷的作用。
- The results show that the size,position and flow pattern of air core should be controlled,in order to keep the stability of hydrocyclone. 研究结果表明，为了使旋流器保持稳定，要合理控制空气核的大小、位置及流动形态分布。
- Optically powered air core current transformer applied in circuit breaker is reported in several aspects including the theory,the structure and the properties. 介绍了一种应用于断路器中的光供电式空心电流互感器的原理、结构及性能。
- The measured results show that the main flow in the hydrocyclone is a three dimensional helical downward movement with an air core directly connected with the underflow pipe. 实验表明，主体流动为三维螺旋的向下运动，中央存在一个和底流口贯通的螺旋形空气柱；
- Air core is an important characteristic of flow field and also a primary symbol of normal working and realization of efficient oil-water separation in hydrocyclone. 空气核是水力旋流器处于工作状态下的一种重要流场特征，也是水力旋流器实现正常工作及有效分离的主要标志。
- The U.S. based Hydraulic Institute has produced the following guidelines for recommended minimum submergence of the pump suction inlet to reduce the probability that strong free-surface air core vortices will occur. 美国水利协会提供下列指导原则,推荐泵吸入进口处的最小的潜水,以便降低产生强烈自由表面空气中心漩涡的可能性。
- Inadequate submergence can result in pre-rotation of the water in the wet-well, resulting in the formation of strong free-surface air core vortices and the entrance of air into the pump suction inlet. 潜水不恰当可能导致湿井内的水预旋转，导致形成强烈的自由表面空气中心漩涡，并使得空气进入泵的吸入进口管道。
- The air in the garden was warm and fragrant. 花园里的空气一片温馨。
- The archers sent their shafts through the air. 弓箭手向空中射出利箭。
- The acceptance standards of air core reactor 空心电抗器的交工验收标准
- complete magnetic shade air core reactor 全磁屏蔽电抗器
- air core spiral strip transformer 带绕式空芯变压器
- The lack of air in the room make everyone sniffle. 屋子里空气缺乏，使得每个人都频频吸气。
- During the intermission, let's go out for some fresh air. 幕间休息时，我们出去呼吸呼吸新鲜空气吧。
- The air held a foretaste of a storm. 天气有要括大风的迹象。
- The air was reeking with the smell of tobacco. 空气中弥漫着烟草的气味。
- A walk in the fresh air will pep me up. 我在空气新鲜的地方散步就感到精神饱满。
- He served one month with the Air Army in Kuwait. 他在科威特的空军里服役1个月。
