对采用伏安法测电阻用到的内接法和外接法电路所产生的误差进行分析。
The error in measure of resistivity by the V-A method is analysed when the circuit is inter-connected or exter-connected.
介绍了国内外主要开发应用的冷成型法、热挤压法、离心铸造法和焊接法等内复合双金属复合管制造技术。
This article introduces inner compound metal pipe manufacturing technology of the cold forming method, heat extrusion method and centrifugal foundry method as well as welding method.
近年来，一种新型高效的焊接法——A-TIG焊正引起世界范围内的高度重视。
Recently, a new type of welding method (A-TIG welding) calls a great attention all over the world.
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