电解加工和电火花加工有什么区别

解题思路：合金是指在一种金属中加热熔合其它金属或非金属而形成的具有金属特性的物质；硬铝是合金，根据常见合金的成分进行分析解答即可．

现代建筑的门窗框常用硬铝制造，硬铝是铝、铜、镁、锰、硅的合金，具有强度和硬度好的性质，
故选B．

点评：
本题考点： 生活中常见合金的组成．

考点点评： 本题考查硬铝的成分，题目难度不大，了解常见合金的组成成分即可正确解答本题，平时注意基础知识的积累．

解题思路：金属和酸溶液反应生成氢气必须具备金属是在金属活动性顺序中排在氢前的金属，若该金属能和稀盐酸反应有气体生成，则说明该金属在金属活动性顺序中排在氢前，若没有气体生成，则说明在氢后；由于Si+2NaOH+H₂O═Na₂SiO₃+2H₂↑，所以在不溶物中加入过量的氢氧化钠溶液由气体生成，可推测有硅存在．

由于样品和稀盐酸反应能生成气体，且有不溶物，说明该样品中除了含有排在氢前的活泼金属以外，还含有不能够和稀盐酸反应的物质；而该不溶物中有能够和氢氧化钠溶液反应的物质，根据题意说明该不溶物中应该含有Si，还含有既不能和稀盐酸反应也不能和氢氧化钠溶液反应的物质，即在金属活动性顺序中氢后的金属Cu，分析选项可知硬铝的组成中一定含有Al、Cu、Si，故选A．

点评：
本题考点： 常见金属元素的单质及其化合物的综合应用．

考点点评： 本题难度不是很大，主要考查了对金属活动性顺序的应用，从而培养学生对金属活动性顺序的理解．

With the application of pulse power technology in the ECM,the gap between the pole extremely reduced, the processing accuracy has improved significantly. ECM is due to the use of electrochemical corrosion in addition to dissolving the processing, metal ions to form are removed, theoretically can reach very high machining accuracy. And post-processing on the surface of the workpiece surface will not produce other special processing methods (such as electron beam, laser, EDM) from the heat affected zone of residual stress and defects. Therefore, be used microfabrication become an important research direction.
This paper analyzes the Micro-ECM principles and features of the Micro-ECM main factors,Discussion on the pulse power of the precision machining parameters and the relationship came to the conclusion : application of high-frequency, narrow width pulse power in the ECM processing is conducive to narrow the gap, enhance localized processing, Stray reduce corrosion, thereby increasing machining accuracy.
Designed and produced a nanosecond pulse power adjustable. Research and analysis of this power supply circuit waveform occurred, plastic circuit and power amplifier circuit theory, the power supply frequency. Duty cycle and pulse amplitude characteristics of the continuously adjustable to meet the general requirements of Micro-ECM wide applications in the future. Applications developed by the nanosecond pulse power for micro-electrochemical machining tests, the successful processing of out-micron level to achieve the desired goals. This suggests that the power of practical, stable and reliable.
大概改了下,有些术语和解释我真的不太清楚

可以,用Electrostatic