The principle of COM technology was introduced, and the elementary method of using ATL to realize the COM module in VC was described.
简单介绍了COM组件技术的原理，并且介绍了在VC中使用ATL实现COM组件的基本方法。
The cage having simpler structure is selected and the principle testing for its dynamic balance is carried out to determine elementary method of cage dynamic balance.
作者选择结构较为简单的保持架，对其动平衡进行原理性试验，以确定保持架动平衡的基本方法。
In the third chapter we introduced elementary principle and method of digital image process.
在第三章介绍了数字图像处理的基本原理和方法。
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