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单选题
电气测量仪表是精密精确的装置，他们都是经过校准的。所有的仪表都应该由生产厂家或经过厂家授权的工厂进行定期检查以保证其精确性。
A
A.instruments are delicate precision devices and calibrited used to measuring electrical .All instruments should be periodically checked for accuracy by the manufacturer or by some shop approved by manufacturer.
B
B.instruments are delicate precision devices and calibrited used to measuring electrical .All instruments should be continuously checked for correct by the manufacturer or by some shop autherized by manufacturer.
C
C.Electrical measuring instruments are delicate precision devices and calibrited.All instruments should be periodically checked for accuracy by the manufacturer or by some shop approved by manufacturer.
答案解析
正确答案：C
相关知识点：
电气仪表需定期检查保精度
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