The main fields of current research on XML safety issues are XML Encryption, XML Digital Signature and XML Access Control.
目前XML安全问题研究的主要领域有：XML加密、XML数字签名和XML访问控制。
The conditions of voltage between contactors and current in main circuit under different using types are analyzed in detail, then designed the control sequences with working mode AC1-AC4.
详细分析了交流接触器在不同使用条件下的闭合与分断时触点两端电压与回路电流情况，并研究了AC1～AC4工作制下的控制时序。
Constant current charging by switch control is the main method to generate non-sinusoid oscillation waveform.
采用开关元件控制的恒流充放电是产生稳定非正弦振荡波的主要方法。
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