介绍了全球定位系统、航迹舵与简易电子海图的基本原理及正确的使用方法，并研究了这三项新技术的应用前景。
The fundamentals and the correct methods of operation of GPS receiver, NAVPILOT and NAVLINES are introduced and the prospect of making use of these three advanced techniques is discussed.
介绍涡流无损探伤仪基本原理、设备组成、使用方法及实际使用情况。
To introduce the principle, equipment composing, use method and practical use of eddy lossless flaw detector.
介绍涡流无损探伤仪基本原理、设备组成、使用方法及实际使用情况。
To introduce the principle, equipment composing, use method and practical use of eddy lossless flaw detector.
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