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Add to basketpaperback. Condition: New. Pub Date :2005-07-01 Publisher: Chemical Industry Press book focuses on helping readers to improve the level of knowledge map. except introduced know the basic knowledge of electrical diagrams. the start of the low-voltage asynchronous motor. speed control and braking control circuit. substation secondary circuit. the relay line of high-voltage electrical equipment has conducted a detailed analysis of the commonly used formula to do a proper introduction. Britannica line analysis easy introdu.