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1.The ballast grading system is designed to ensure the safe operation of electrical equipment.
该电感负荷分级系统旨在确保电气设备的安全可靠运行。
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2. The engineers carefully graded the ballast to optimize its performance.
工程师们仔细分级了电感，以优化其性能。
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3. The new ballast grading technology has greatly improved the efficiency of power distribution systems.
新的电感负荷分级技术极大地提高了配电系统的效率。