With the scale of power system larger and larger, the whole power system gets more and more complicated, and operation safety and stability of machines and grid become very important.

随着电力系统规模不断扩大，整个电力系统变得越来越复杂，机组和电网的安全运行及稳定性问题变得越加重要。

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There are more and more applications of vacuum circuit breaker in power plants and its vacuum degree has directly influences on the safety of power system.

真空断路器在电厂的应用越来越广泛，其真空值直接影响到电厂及电力系统的安全运行。

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New demands such as high integrated level, good portable feature, low power consumption and durability as well as safety and reliability of test has drawn more and more attention.

在对测试的安全性和可靠性要求越来越高的同时，对测试系统也提出了许多新的要求，如集成度高、便携、小功耗和耐用等。

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Washington (CNN) -- The Senate passed a food safety bill to give more power to the Food and Drug Administration on Tuesday, more than a year after the House of Representatives passed a similar measure.

CNN: Senate approves long-delayed food safety bill