The phrase “sources of law” is often used to describe methods and procedures by which law is created and developed, or t“法的渊源”通常是被用来描述产生和制订法律的方法和程序，或者是特定法律的权威性和强制力的渊源。
Which have the following advantages: high coercive force, high electric resistance, long-time stability, and economical 它们具有：高矫顽力、高阻抗、长效稳定性和经济的价格。