單項(xiàng)選擇題陰極保護(hù)正常運(yùn)行時(shí)對(duì)埋地鋼質(zhì)管道干線的運(yùn)行率應(yīng)大于98%,且對(duì)其的保護(hù)率應(yīng)為()

A.95%
B.99%
C.100%
D.98%


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