switch tube meaning in English

开关电子管
开关管

Generic specification of vacuum switch tubes for load switches
负荷开关用真空开关管总规范
Grading standard of quality for vacuum switch tubes for contactors
接触器用真空开关管质量分等标准
One - step sealing of ceramic to metal with dismatching for a vacuum switch tube
金属非匹配性一步封接
Grading standard of quality for vacuum switch tubes for load switches
负荷开关用真空开关管质量分等标准
Grading standard of quality for vacuum switch tubes for circuit breaker
断路器用真空开关管质量分等标准

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