The teaching strategy has many good characters , such as the pertinency , maneuverability , selectivity , processiveness , flexibleness and so on 教学策略具有目标指向性、针对性、可操作性、择优性、过程性、整体综合性、层次性和灵活性等特点。
By uses of relay ' s integrate , the pressure distribution of radiate sound field by rectangled plunger was derived , the directivity of wave steering also was discussed 画出了声压分布图，并就单个矩形活塞的指向性进行了研究，画出了指向性图。
Magnetic compass is one of directional navigation instrument in ship fitting , the deviation of magnetic compass will influence the navigational safety of ship 摘要磁罗经是船舶装备的主要指向性航海仪器之一，磁罗经自差的大小将直接影响船舶的航行安全。
Fibre optic interconnecting devices and passive components - basic test and measurement procedures - examinations and measurements - directivity of fibre optic branching devices 光纤互联装置和无源部件.基本试验和测量程序.检验和测量.光纤分路器的指向性
The length between each unit is 0 . 16m , and the whole hydrophone is 0 . 52m long . in a normal cistern , the directivity and sensitivity of the hydrophone is tested with an impulse method 在非消声水池中,用脉冲方法,采用测试信号频率为4688hz , 5度为间隔,测得其指向性。
The directional of microphone : the unidirectional and the noise canceling microphone have vents at the bottom ; oppositely , the omnidirectional microphone is completely sealed 麦克风指向性:麦克风背有有气孔的,就是有指向性或抗噪型的麦克风,完全密封的,就是全指向的麦克风
The results of the numerical simulation show that the acceleration of lateral vibration can be reduced 75 % if the active control system is applied on a radar antenna 由数值分析结果显示，利用本方法，可将指向性天线振动减少75 % ，此外对天线振动导致之伺服干扰也能有效抑制。
Fibres optic interconnecting devices and passive components - basic test and measurement procedures - part 3 - 20 : examinations and measurements - directivity of fibre optic branching devices 纤维光学互连设备和无源元件.基本试验和测量过程.第3 - 20部分:检验和测量.光纤分支设备的指向性
For sound pickup , acoustic processing aims at the design of transducers or transducer arrays to achieve a durable directionality ( beam steering and width control ) as well as noise resistance 对于拾音，声学处理的目标是设计耐用的指向性（束调整和宽度控制）及抗噪声换能器或换能器阵列。
The system automatically amplifies sounds coming from the person in front of the individual wearing a trianotm hearing instrument , while minimising the competing signals from behind , or around them 在特定环境中，这系统会透过指向性技术扩大前方接收的声音，同时间亦减少来自后方及四周的噪音，从而提升在噪音环境中的交谈能力。
