A.冗余配置B.提高設(shè)備性能C.定期檢測(cè)D.定期更換
A.各熱電勢(shì)的總和B.各熱電勢(shì)的平均值C.熱電勢(shì)最大值D.熱電勢(shì)最小值
A.20%~90%B.10%~80%C.20%~80%D.10%~90%