常用电量变送器输出侧仪表精确等级不应低于多少?(  )

常用电量变送器输出侧仪表精确等级不应低于多少?(  )A.1.5级 B.2.5级 C.1.0级 D.2.0级

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They __ the evidence in the past.(  )

They __ the evidence in the past.(  )A.held B.have held C.are holding D.have bee

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